Grass filter tips are short cardboard or paper cylinders that you roll into the mouth end of a cannabis joint. They keep loose flower and hot ash out of your mouth, cool the smoke a bit, and hold the end of the joint open so it pulls evenly. Most run about 6 to 8 mm across and come perforated in a booklet so you tear off one at a time.
What a tip does and does not do
It is a mouthpiece, not a cigarette filter. Cardboard stops plant matter and resin from reaching your lips, and the extra length gives the smoke a moment to lose heat before it hits your throat. It will not strip tar or THC out of the smoke. If you want actual filtration, that is a different product, usually an activated charcoal tip or a water pipe, and even those only change the picture partly. The main job here is mechanics: a joint with a tip burns straighter and does not collapse at the end.
Types you will run into
- Perforated cardboard. The standard. Cheap, firm, holds shape when wet. Widths from 5 mm to 12 mm.
- Unbleached or hemp paper tips. Softer, slightly wider when rolled, good for people who dislike a stiff mouthpiece.
- Cotton or cellulose tips. These do catch some particulate. Bulkier, so they suit cones more than hand rolls.
- Glass, ceramic, and wood tips. Reusable, stays cool, feels heavier in the hand. Glass is the easiest to inspect and clean.
- Charcoal tips. A carbon section inside a paper sleeve. Worth trying if smoke harshness is your main complaint.
How to roll one into a joint
- Tear a tip from the booklet and roll it between your fingers into a snug cylinder, tighter than you think you need.
- Slide it into one end of the paper, flush with the edge, with the spiral seam facing the direction you will roll.
- Pinch the paper around the tip first, before you add flower. That locks the shape.
- Sprinkle ground flower along the rest of the paper, a little more near the tip end.
- Roll, tuck, seal, and pack the flower down toward the tip with a gentle tap. Leave a small gap so the draw is not blocked.
Sizing for CBD hemp flower
Hemp flower tends to be denser and a touch moister than a lot of high-THC flower. That matters. An 8 mm tip with a slightly looser roll keeps the draw open, while a narrow 5 mm tip plus a tight pack is the fastest way to a joint that pulls like a milkshake straw. If you are rolling cones, match the tip to the cone's mouth diameter; a tip that is too small slides out mid-smoke.
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Reusable tips and cleaning
Glass and ceramic tips go a long way. Soak them in isopropyl alcohol for 20 to 30 minutes, scrub the bore with a pipe cleaner or a cotton swab, rinse with warm water, and let them dry fully before the next session. Resin builds up faster than people expect, and a half-clogged tip tastes like the last joint. Cardboard tips are single use. Reusing a wet one is a good way to get a mouthful of ash.
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Mistakes I see most
- Rolling the tip too loose, so it unspools inside the paper.
- Packing flower right up against the tip with no gap, which kills airflow.
- Buying one width for everything instead of keeping 5 mm and 8 mm on hand.
- Skipping the tip entirely on a hand roll and then wondering why the last third is a tongue burn.
A booklet of cardboard tips costs less than a coffee and changes how a joint smokes more than most gear upgrades. Start with a mid-width, unbleached cardboard tip, learn the pinch-and-roll move, and adjust size from there.