Our Round Bottom Bangers are handmade in the heart of Long Island at Long Island Glass Studios in small batches. 10mm or 14mm Island Quartz Banger (male joint) in both 90 degree and 45 degree joint angles. 3mm thick walls with a 4mm round bottom for extra heat retention. Extra deep bucket to prevent terps from getting sucked up the straw. Available in 25mm or 30mm Buckets. Rounded bottom for easy maintenance. Made with American GE-214 quartz and machine ground fittings. Beveled inner lip for the perfect air seal. Shipped in a custom display case (included in price). Great for Cold Starts!