(1small,2midium,1 large) Material:ABS+TPU Membrane,with smart lids,you can vacuum seal any bowl,jar ,cup or can in almost any size,shape or material! Just place lid over your container and press down center of lid to create a vacuum seal.Made of space-age polymers that keep food fresher 5*longer.When you're ready to use,just lif the lip and hear the vacuum seal rlease.

4PC Smart lids