1.The cage control box used safe and reliable housing of imported nylon. Flame retardant level V0. 2.The cage control box processed with internationally popular matte metallic color. The keys' surface is covered with bright and eye-catching colors achieved with special processing technology treatment. No wear or discoloration after long-term use. 3.The cage control box keys' surface is covered with bright and eye-catching colors achieved with special processing technology treatment. No wear or discoloration after long-term use.