The Rollerblade New Jack 4 Aggressive Skates are your go-to, jack-of-all-trades skate. Whether you spend your days in the park or shred up the street, these skates will work for you. They are durable and versatile boasting all the features you need to ensure that you can slay with the best. Many of the components are removable so when you abuse these to no end and need to change some pieces out then you can. The cuff buckle, cuff, grind inserts and frames can all be taken away. The Specialized Liner has a PU Foam shock absorber and double padded tongue so that you are well-protected and comfortable all day. The standard lace closure, 45 degree Velcro Band and removable buckle keep you securely inside while maintaining a custom fit. Offering good flex for grinds and made for the intermediate, the Rollerblade New Jack 4 Aggressive Skates have great function and high-performance for the serious skater. . Outsole Material: Not Specified, Skill Range: Advanced Intermediate - Expert, GTIN: 0885315478917, Model Number: 07321400 744 230, Product ID: 303542, Model Year: 2013, Frame Type: Blank with 8mm Axles and Aluminum Frame Spacers, Shock Absorber Type: Polyurethane Foam, Anti-Rocker: Yes, Liner Type: Specialized Liner, Maximum Wheel Size: 60mm, Bearing Grade: Recreational, Bearing Type: SG7, Wheel Durometer: 90A, Wheel Configuration: 60mm-AntiRocker-AntiRocker-60mm, Tongue: Double Padded, Skate Type: Aggressive