D-Still 370ml Unbreakable Rocks Glass, Set of 4, 1 Year Warranty You can make almost any drink in a rocks glass, making the 370ml Polycarbonate an Rocks Glass an all-purpose staple cup you must add to your drinkware collection! This would make a great present for a loved one Unbelievably glass-like and unbreakable, these glasses will be by your side for any occasion