our black rubber granules are made by recycled rubber, environmental friendly, cold resistant, hot resistant, high elastic... SBR granule( recycled rubber granule) 1)Features:Uv resisitanceAnti-ageingProtect ... 3-5mm 3)Color options: earth yellow, multicolor & black, 4)Applications: prefabricated rubber rolls, tennis courts,speed railway, basketball courts, tathletic tracks ...