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This is an elevator roller. They have an Outside diameter of 60mm with an Inside diameter of 25 mm and a Width of 30 mm, with two 6005-ZZ bearings. 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.