Made of high-quality food grade plastic, it is sturdy and durable, not easy to damage or crack. Ideal for freezers and refrigerators as well as dry and liquid storage. A set includes 4 bottle caps, which have a diameter of 2.76 inches and 6 of which have a diameter of 3.39 inches. The outer vertical pattern design effectively increases friction and prevents hand slipping. It is easier to tighten or open the bottle cap Red, yellow, green, white Rich colors give you more choices Adding great fun and color to the family PREMIUM MASON JAR LIDS - These heavy duty lids are specifically designed to be functional and durable. The leak proof seal will keep contents airtight providing you with secure no worries storage! BPA FREE - Designed with the end user in mind, the LYCAQL mason jar lids are made with BPA free plastic, providing a hassle free storage solution for soups, yogurts, grains and much much more! EASY TO OPEN & SECURELY CLOSE - Multi functional design, the LYCAQL canning jar lids have built in grips on the multi faceted sides to easily open or securely tighten the lid onto a jar! AIR TIGHT - With a premium airtight seal on each lid, these lids are perfect for a multitude of functions. From storing arts and crafts to beauty and hardware supplies, you are bound to find multiple fun and useful ways these lids will improve your storage needs! HEAVY DUTY - With precision engineering and heavy duty construction, these premium plastic lids will never warp or rust. Enjoy the superior functionality even in the refrigerator or freezer and put it right in the dishwasher for easy clean up!