Estilo Glass Water Bottles 20 Oz, Stainless Steel Cap with Protective Silicone Sleeve - Set of 4 (Green, Black, Blue, Pink) Set of 4 Reusable Glass Bottles with stainless steel cup + a protective silicone sleeve Environmental and High-quality Material: Bottles are made of ultra clear Soda Lime Glass. It is a kind of low expansion rate, high temperature resistance, high strength and hardness, high transmittance and high chemical stability The cap is made of high quality stainless steel, and seals are made of FOOD GRADE SILICONE, safe, environmental and prevents leaks Easy to wash: The glass is super smooth, which is very easy to wash just by clear water Capacity: 20 oz. Dishwasher safe. Protective silicone can be easily removed and replaced