... keyboard 2.flexible/portable/roll up/silicone/waterproof keyboard 3, KB-2003N 4, Made of silicone Inner Packing: 1pc/Plastic BarrelOuter ... keys1, environmental protection, use of imported high-end medical-grade silicone materials, non-toxic, tasteless and harmless. 2, all- ... keyboard is lean, and use of special high-strength silicone adhesive glue, without any metal nails, performance stable and ...