Precautions: 1. It is not recommended to use hot water or dishwasher. 2. Not recommended for use in a microwave oven or a heated environment. 3. Dry naturally, do not over-expose to the sun. Silicone vs PEVA: 1. Silicone is a little heavier, thicker single layer, can be heated in a microwave oven, and has better durability. 2. As a new type of material, PEVA is lighter in weight and safer than silicone. They are completely free of plastic and environmentally friendly materials. However, PEVA is thinner and cannot be heated in a microwave oven. 3. Choose PEVA or silicone bag according to personal needs. package: 5.3x8.3 in:6pcs 7.7x8.7 in:6pcs 10.7x11in:2pcs Weight: 270g Single layer thickness: 0.25mm