... keys1, environmental protection, use of imported high-end medical-grade silicone materials, non-toxic, tasteless and harmless. 2, all-sealed ... the keyboard is lean, and use of special high-strength silicone adhesive glue, without any metal nails, performance stable and ... coffee and smoking the white-collar workers, or the work environment has much dust. 2, laptop users - can use soft silicone keyboard ...