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This is an elevator roller. They have an Outside diameter of 80 mm with a width of 30 mm and the inside diameter of 25 mm with two 6205-ZZ bearing. They are made of a Polyurethane elastomer called ACLATHAN/Vulkollan®. The hardness of the roller is 94 Shore A. For quantities greater than 4, please email sales@aclausa.com for a quote.