1,100% eco-friendly silicone material . 2,food grade, odorless and non-toxic. 1,100% eco-friendly silicone material .2,food grade, environmental ,odorless and non-toxic.3,Varuous kinds of color and different size is availble 4,accept customers' logo 5,Our silicone O ring have good waterproof effect to prevent milk spilled .6,high quality , competitive price 7,best service,fastest delivery