*Material of Shell:ABS *Material of Cushion:PU Foam Soft Cushion with High-Density Sponge *Certification:CE EN352-1:2002 *Noise Reduction Coefficient:NRR 29dB *Usage:Plug in the Side Slot of Helmet *Packing:1 set / Color Box 50 sets / Carton,12 / 11kg,46 x 31 x 58cm