Aerospaced Groove 4-Piece Aluminum Grinders June Featured and spacious expansion chamber

and spacious expansion chamber

It's made on 25mm tubing with a fission dowstem that diffuses the smoke through water and is fixed inside the pipe to prevent damage

a single or double showerhead perc for extreme diffusion

The classic beaker design is available in single

or triple perc styles-- 50mm diameter by 5mm heavy wall borosilicate glass

Aerospaced Groove 4-Piece Aluminum Grinders June Featured and spacious expansion chamberFeaturing innovative coaxial turbine technology, Groove has changed the nature of grinders as we know them. Through its proprietary design, Groove requires minimal material preparation and delivers a light, feathery end grind, naturally separating unwanted material for optimal purity.