It is a mini size ice cube tray that makes the ideal sized cubes that fit neatly inside of sports bottles and blenders. This item is made with freezer-safe, easy-flex material to pop out cubes with just one easy twist. This freezer ice tray is designed with built-in stacking lugs to conserve space in your freezer. It's constructed of BPA-free food-safe polyethylene. This material allows this item to remain durable and break-resistant. It's also dishwasher safe so you can just throw them in whenever you need to clean or disinfect them.