1.Food grade materrial: free, made of Approved Food Safe material polyethylene. Reusable and can be used for sous vide cooking safely. Lower energy loss during cooking. Provide healthier, and more convenient cooking . 2.No more middle of the night water level alarms: Sous vide balls are to minimize the effect of heat loss and water evaporation, allow you cook water for hours on end without ever having to re-fill. Due to the surface exposure between the water and air, water hardly evaporates during the cooking process. 3.No more lids: Acts as lid to reduce splashing hazard and allows easy access to all shapes and sizes contents. 4.Drying and storing easily: Packed in practical mesh bag, facilitates the drying process after use and for easy storage. You could put all the balls in and hang up the bag in somewhere and without mess. Reduces the risk of splashing hot water onto your skin. Fit any shapes and sizes pot or container. Size:20mm Material:-free PP Colour:white Package Contents: 250 * sous vide ball 1 * mesh bag Only the above package content, other 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.