10mm thickness, Rough Blue (textured or matte blue) 88A Durometer Endless Round O-Ring Drive Belts. These textured Polycord® equivalent round O-ring belts should be used when better abrasion resistance is needed. Typical stretch is 6-10%. The blue belts are food grade polyurethane. Polycord® is a trademark of Habasit AG. This is rare cord and we might not be able to make small orders if we dont have any in stock.