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This is a Cemco elevator roller. Their part number was CM-2603. They are 196.9 mm in outside diameter, 30 mm inside diameter and 34.9 mm wide, with one bearing 6306-ZZ. Polyurethane elastomer, 94 Shore A ACLATHA/Vulkollan®. For quantities greater than 4, please email sales@aclausa.com for a quote.