1. Soft silica gel, non-toxic, good preservation, no hand injury.2. The sealing design is novel and unique.3. A set of 8 colors, rich colors, easy to use.4, designed to help keep beer fresh and safe.5. It is suitable for glass bottles, such as beer bottle, beverage bottle, glass bottle, soy sauce bottle, vinegar bottle and milk bottle. suitable for most standard beer bottles and some larger stylescolor:Random color (cannot choose specified color)Material:Silica gelsize:3.3 x 1.7cmPackage Contents:8 x Bottle CapOnly the above package content, other products are not included.Note: Light reflection 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.