Canning Lids: Compatible with most ordinary regular mouth mason jars. The jar lids thicken the thickness of the lid's body to make food preservation more secure. Superior Airtight: Sealing ring inside the jar lid makes the mason canning jar lids have good sealing performance, can keeping food, grains, dressings, drinks . You don't have to worry about leaks causing pollution to the environment. Safety and Health: Food grade metal canning lids are constructed from premium material. With excellent durability and rust resistance, and can withstand certain low and high temperatures. You can use it with peace of mind. DIY on the Jar Lids: You can mark canning jar lids regular mouth with food information and storage dates, or use your bold artistic imagination to leave any mark you like, these mason Jar Lids can not only store food but also become your handicraft. colour:Silver Material:metal size:70mm Package Contents: 50 x cover Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.