Mastrad A00813 Cocktail Rocks Icecube Tray Ice rocks help keep your drinks colder, longer Easy to remove ice from the tray; Flexible silicone base means rocks pop out easily onto the lid with a simple push of the fingers Easy to grip handle ensures a secure hold when in transport from sink to freezer Lid prevents spills and keeps odors out and freshness in; lid allows you to stack multiple trays at a time Trays nest together when not in use to save space