rubber key 100% food grade silicone,FDA/RoHS/PAHS is approval soft and used comfortablely rubber key(1)100% food grade silicone,FDA/RoHS/PAHS is approval,material is environment-friendly,nontoxic.if large quantity,we can offer any certificate as you requested.(2)soft and used comfortablely,no noise while typing(3)waterproof and dustproof(4)durable,abrasion resistant,corrosion resistant,colour of ...