Here is our Cosmic Squares pattern etched quartz banger. Hand made in the heart of Long Island at Long Island Glass Studio. Perfect for any piece with clear or has any engraving work. Or is great for any sacred geometry style piece. Available in 10mm or 14mm (male) ground glass joint, both 90° + 45°. Now with 25mm or 30mm cups! With a 3mm thick extra deep wall and 4mm base these bangers were designed to retain Heat. the proof is in the puff . Deeply beveled inner lip for the perfect air tight seal. All of our art is deeply etched with highly detailed engravings one at a time.