Short answer
A mini keychain spoon pipe is a spoon pipe about 2 to 3.5 inches (51 to 89 mm) long with a split ring at one end. The bowl holds 0.1 to 0.3 grams of ground flower. Metal and silicone models take pocket wear. Glass models crack on a hard drop. Most sell for $8 to $25.
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Parts and sizes
- Length: 2 to 3.5 in (51 to 89 mm)
- Bowl opening: 0.4 to 0.75 in (10 to 19 mm)
- Load: 0.1 to 0.3 g ground flower
- Weight: 15 to 40 g (metal), 20 to 50 g (glass)
- Split ring: 25 to 30 mm
- Air hole: 1 to 2 mm, present on some models, absent on others
Materials
Metal
Aluminum, brass, and stainless steel are the common builds. Aluminum heats in about 10 seconds. Brass holds heat longer. Stainless steel resists scratches. A screw cap seals the bowl and keeps ash out of a pocket. Many mini pipes take a 10 to 12 mm screen.
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Glass
Borosilicate walls run 2 to 4 mm thick. Glass gives the cleanest taste of the three materials. A glass keychain pipe breaks on tile or concrete from 3 feet. Most ship with a metal ring and a rubber grommet.
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Silicone
Silicone bodies handle about 450 F. The bowl needs a metal or glass insert. Silicone holds odor after use. Wash it with warm water and mild soap, or the smell transfers to a bag or pocket.
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Loading and use
- Grind flower to 2 to 3 mm pieces.
- Fill the bowl to the rim. Do not pack it down.
- Cover the air hole, light the edge of the bowl, and draw.
- Release the air hole to clear the chamber.
A 0.2 g load gives 3 to 5 draws. Reload when the ash turns gray. Small bowls cool fast, so a hemp wick or a soft flame keeps the hit smooth.
Cleaning
Use 91% isopropyl alcohol and coarse salt. Soak metal and glass parts 15 to 30 minutes, then shake the pipe in a sealed bag. Rinse with warm water and let it dry. Resin plugs a 2 mm air hole in about 5 to 10 sessions. Clean the ring threads too, or the cap sticks.
Transport and law
Cannabis is legal for adults 21 and over in more than 20 US states and DC. Paraphernalia rules differ by state. A pipe with resin can count as paraphernalia in some states. Federal law lists cannabis as Schedule I. Check state law before you carry a used pipe across a state line.
Odor control: clean metal and clean glass hold little smell. Silicone and uncleaned pipes smell. A capped metal pipe or a smell proof pouch cuts the odor note in a pocket or bag.