Ultra-clear squat cups are made of premium plastic with crystal clarity that allows the full appeal of foods and drinks to show through. Smooth rolled rim makes sipping easy. Crack-resistant PET material is sturdy yet flexible. They withstand the rigors of countless product applications, such as frozen drinks, fruit smoothies, iced coffee, beer and more. Cups are designed for use with Dart PL4TSN, PL4N, DLR685 and DNR685 lids (sold separately).