... -3.5mm Safety-Color Ceramic AggregatesUse:They are for highways, airports, airport runway, railway stations, subway ,which is a new building materials ... warning ahead of time to slow down traffic and pedestrian safety purposes.Function:Avirulent insipidity, corrosion resistance, high hardness, wear ... pallet.Sincerely, We look forward to receive your early inquiry! Safety Color Ceramic Aggregates