Ideal for outdoor surfaces such as asphalt and concrete. Built to last with street-level 85A hardness. Durometer has been tested and proven to be 85A hardness. High rebound technology providing more speed and force with each stride. Fits all standard roller skates. Abrasion resistant endurance urethane for superior outdoor wear and great grip. Includes 4 outdoor 85A wheels. Standard hub wheel designed for the standard 608 bearing size. Ideal for outdoor surfaces such as asphalt and concrete. Built to last with street-level 85A hardness. High rebound technology providing more speed and force with each stride. Fits all standard roller skates. Abrasion resistant endurance urethane for superior outdoor wear and great grip. Includes 4 outdoor 85A wheels. Standard hub wheel designed for the standard 608 bearing size.