Arcoroc Conical Conique Tumblers 640ml (24 Pack)Crafted for everyday use, Arcoroc's Conique Conical tumblers are made from extra resistant, fully tempered glass. This special treatment ensures they can handle thermal shock without cracking or breaking. And for added peace of mind, even if a breakage occurs, the glass shatters into small, smooth shards for safety. Plus, these tumblers are dishwasher safe and show no wear or tear even after enduring over 2,000 cycles in a professional dishwasher.