[FOOD GRADE MATERIAL] - Our Wooden Jar lids are made with natural wood and Food Grade Silicone,You 't have to worry about the health of your family. [SEALING SAFE] - These wooden lids form an airtight silicone seal with /Kerr jars, making them perfect for dry foods and pantry storage,So as to better the freshness and health of the ingredients in the food storage containers and make the food very dry. [PACKING INCLUDED] - that fit all standard All Sealed jars; ; not safe for preserving; hand-wash only and clean well before use. DOUBLE-LAYER LACQUER & STRONG PROTECTION - wood jar lid in the production of double lacquer baking, gives wood greater protection, while making bamboo lid more smooth, easier to clean. Dishwasher safe, no longer limited to hand washing. [SPACE SAVING] - Easy stacking with most /Kerr jars, easily fit into your refrigerator, freezer which enables you to get the kitchen organized and frees up space in the pantry.