1) Compostite material, no bad smell 2) High strength, wearable 3) Good quality, long spanlife 4) Competitive price The composite material does not contain of asbestos, lead, zinc and chromium alloy. And it does not toxic materials. Friction of the material does not cause the smell.Performance:1) The brake block does not cause excessive worn out to the wheel;2) The brake block does not cause ...