Rolling papers
by Actitube
The actiTube Slim activated charcoal filter is a 27mm carbon-packed filter tip that slots into your rolling papers or pre-rolled cones to catch tar and other unwanted byproducts before they reach your lungs. Made in Germany since 2001, each filter uses activated carbon granules capped between two ceramic ends — giving you a noticeably cooler, cleaner draw without killing the flavour of your smoke.
Standard cardboard roaches do one job: stop bits of herb flying into your mouth. That's about it. They don't filter much of anything. An activated charcoal filter actually traps a portion of the tar, particulate matter, and gas-phase compounds that come with combustion. According to a study published in PMC (Effect of Charcoal in Cigarette Filters on Free Radicals), when cellulose acetate filters were modified to include activated charcoal, reductions in gas-phase radicals of over 70% were observed. That's a significant difference from a small addition of carbon.
The practical result? Each drag feels smoother and tastes cleaner. You still get the flavour profile of whatever you're smoking — the carbon doesn't strip that out — but the harsh, scratchy edge that makes you cough is reduced. We've had customers switch to these and tell us they can't go back to plain cardboard tips. It's one of those upgrades you don't think you need until you try it.
The "Slim" in the name refers to the 6.9mm (effectively 7mm) diameter. The standard actiTube filter is 8mm — fine for certain pipes and wider rolls, but a bit chunky for slim papers like OCB Slim or RAW Black. The Slim version fits neatly into king-size slim papers without stretching the paper or creating an awkward seal. At 27mm long, it's compact enough to leave you plenty of rolling space.
One honest limitation: these Slim filters do not fit the actiTube "Tune In" smoking pipe. That pipe is designed for the full-size 8mm filter. If you're buying these specifically for a pipe, double-check the diameter first. For hand-rolled cigarettes and blunts, though, the Slim is the better pick — it sits more naturally and doesn't dominate the roll.
| Specification | Detail |
|---|---|
| Brand | actiTube (formerly Tune Smart Smoking) |
| Origin | Germany |
| Filter material | Activated carbon (charcoal) with ceramic caps |
| Diameter | 6.9mm (Slim) |
| Length | 27mm |
| Compatibility | Rolling papers, pre-rolled cones, select slim pipes |
| Not compatible with | actiTube "Tune In" pipe (requires 8mm filter) |
| SKU | HS0462 |
Activated carbon is regular charcoal that's been treated — usually with steam or acid — to open up millions of tiny pores across its surface. This massively increases the surface area. A single gram of activated carbon can have a surface area of over 3,000 square metres. Those pores act like microscopic traps: as smoke passes through, gas-phase compounds and certain particulates get adsorbed (that's "ad-" not "ab-" — they stick to the surface rather than being absorbed into it).
The research from PMC noted that decreases in radical production were dose-responsive with increasing amounts of charcoal, with as little as 25mg of activated carbon showing measurable effects up through 300mg. The actiTube Slim packs its carbon between two ceramic caps that keep the granules in place and prevent any loose bits from reaching your mouth. The ceramic also helps cool the smoke slightly before it hits your lips — that's where the smooth, almost velvety draw comes from.
We've been stocking actiTube filters for years, and the feedback is remarkably consistent. Customers who roll daily notice the difference on the first puff — the smoke feels lighter, less acrid, and the aftertaste is cleaner. A few people have told us they expected the carbon to mute the flavour of their tobacco or herb blend, but it doesn't. What it does mute is the harshness. Think of it like a good water filter: you're removing what you don't want without stripping out what you do.
The one thing we'd flag: these are single-use filters. You can't rinse them out and reuse them. Once the carbon is saturated, it stops working. For daily smokers, that means going through them at a fair clip. But at this price point, it's a minor cost for a genuinely better smoking experience. And honestly, if you're rolling 3-4 a day, your lungs will thank you for the carbon assist.
Complete your rolling setup with OCB Slim rolling papers or RAW Black King Size Slim — both pair well with the 7mm diameter of the actiTube Slim. If you prefer a pipe, check out the actiTube pipe range (just remember to grab the standard 8mm filters for those, not the Slims).
| Feature | actiTube Slim (Activated Carbon) | Standard Cardboard Tip |
|---|---|---|
| Filtration | Activated carbon adsorbs gas-phase compounds and tar | Blocks loose material only |
| Smoke temperature | Cooler — ceramic caps dissipate heat | No cooling effect |
| Flavour impact | Reduces harshness, preserves flavour | No change to flavour or harshness |
| Reusability | Single use | Single use |
| Diameter | 6.9mm | Varies (typically 5-7mm) |
| Cost per filter | Higher | Lower |
Yes. The 6.9mm diameter is designed to sit comfortably in king-size slim papers like OCB Slim or RAW Black. No stretching, no awkward gaps. They're the best activated charcoal filter option for slim rolls.
No. Each filter is single-use. Once the activated carbon is saturated with adsorbed compounds, it can't trap any more. Using a spent filter gives you no more filtration than an empty tube.
It won't strip the flavour. The activated carbon targets gas-phase radicals and tar — the harsh, bitter compounds. The actual flavour profile of your herb or tobacco comes through cleaner and smoother.
Diameter. The Slim is 6.9mm, the standard is 8mm. The Slim fits rolling papers; the standard fits the actiTube pipe range. Length is 27mm for the Slim. Choose based on what you're rolling or smoking with.
No. The Tune In pipe requires the standard 8mm actiTube filter. The 6.9mm Slim will be too narrow and won't seal properly. If you own the Tune In pipe, grab the regular actiTube filters instead.
According to research published in PMC, charcoal-modified filters reduced gas-phase free radicals by over 70%. The effect was dose-responsive — more charcoal meant greater reduction, starting from as little as 25mg of activated carbon.
For gas-phase filtration, yes. Cellulose and foam filters primarily catch particulate matter. Activated carbon adsorbs gas-phase compounds that other filter materials let through. If reducing tar and harshness is the goal, carbon is the way to go.
Last updated: April 2026
