It is safe to use and has no pungent odor to affetct your food. It is a great helper in yout kitchen, so you can have dry the healthy food for making fragrant cuisine. The product provides a secure silicone sealing gasket that matches the jar to create an optimal seal and prevent leaks, locking in food freshness. It is constructed of silicone material. Diameter and inner diameter of this product is 9.5cm and 6.9cm. It can be used to for jars to protect yout food from water and dust. Item Name: Sealing Ring Material: Silicone Features: Great Tightness, Safe, Food Grade, Durable Size Details: Diameter: 9.5cm/3.7" (Approx.) Inner Diameter: 6.9cm/2.7" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 10 x Sealing Ring