Made of ABS and silicone rubber, easy to use, no need to wash manually, you can enjoy sodas Specifications: Material: Silicone Material: ABS, Silicone Product Size: Approx. 5*4.5 cm/1.97*1.77 inch Shelf Life: Approx. 7 days Warm Reminder: Please use vinegar and water before first use Do not heat in microwave Package Contents: 1 * Soda Saver Cover