UNIVERSAL SIZE - The pet food can cover has three rings, Inner Diameter are 2.5", 2.9", 3.3" and stretches a bit, Fits standard type of Pet Cans,like 3 oz,5.5 oz and 12 oz cans. EXCELLENT AIRTIGHT - The lid is made of silica gel which is very soft and flexible,allow to fit snugly and grip the rim of the cans giving a good seal.keep the food fresh longer and and prevents the fridge from smelling like pet food. SAFE and NONTOXIC - These dog cat food can lids are Made of Premium Silicone at food grade,BPA free,safe and nontoxic,could restore with food long time with no harm. EASY to USE - Quite flexible and pliable, easy to pull on, and they have a little handle with bump design for easy removability. DURABLE - Silicone can covers will not crack,melt,or warp. Withstand high temperature. Dishwasher safe.