The XXFirm Junk Voodoo is smooth with a great roll. Junk Voodoo XXFIRM Inline Speed Wheels The Newest Junk Voodoo XX Firm wheels by MPC featureA New Redesigned natural Turbo HubThe Best Urethane available on the speed marketA Zero tolerance for defectThe XXFirm Junk Voodoo is will be smoothwith a great roll. The Junk Voodoo is also available in80, 84, 90, 100 & 110 mm Outdoor wheels XXFIRM(Priced in Unit) Features Features Junk VooDoo XXFIRM Inline Speed Wheels The all-new Junk VooDoo XXFirm by MPC Our VooDoo Wheels use no pigments through the hub or the urethane, giving you pure, raw performance.It uses a newly redesigned natural turbo hub.This turbine hub is made under our most strict standards, using a new, one-cavity tool, instead of 4 cavities, the industry standard.which allows us to control the quality of each hub and make sure there are no deviations from wheel to wheel. For urethane we chose MPC's Magic Urethane, our best formulation ever, known for its performance under thefeet of the world's greatest inline speed skaters. It offers excellent grip, roll, and wear characteristics. Our engineers carefully considered every aspect of the design, from hub stiffness and size, to a sandwiched Mtech® inner ringinside the cutting-edge Magic urethane. MTech Soft Heart, Hard Body is the essence of MPC's patented andinstantly recognizable technology that combines a soft inner ring with harder outer urethane. This ingenious combination allows wheel flexing for grip and greater rebound for energy return, making the wheels last longer and roll better. With zero tolerance for defects and a demand for excellence, you can rely on The new Junk Voodoo Inline Speed SkatingWheels for consistent performance, a perfect tool for whatever race you find yourself in. You will choose this wheel when you need superior control in tight turns, as well as straight-line speed on all road and track events.It has superior, all-around performance for any skater. It comes in three different hardness choices:FIRM for when race conditions are rough or slick.XFIRM is for when race conditions are hard, smooth, and dry.XXFIRM for when you are looking for the wheel with the most roll. Size Options: 100mm & 110mm - 90mm, 84mm, 80mm & 125mm Hardness Options: FIRM (82 to 84A), X-FIRM (84 to 86A), XX-FIRM (86 to 88A) Hub: Natural turbo hub, T72mm Urethane Color: Magic Natural Urethane MTech®: Trans Red Inner Ring 63A Uses: Track, Road, Marathon Technical Specifications Technical Specification Junk Inline Skate Wheels:All of our dual urethane wheels use a multi-layer technology called Mtech® ,Soft Heart, Hard BodyJunk Wheels are comprised of two layers: a soft, highly resilient (not unlike a super-ball) inner layer that acts asa pneumatic tire and a durable outer layer of long-wearing, surface-hugging urethane.The result is wheels with the largest footprint (ultimate grip), highest rebound (fastest), and firmest outer tread (best wear) available.All of our wheels are proudly made with love by the good people at MPC Wheels, in Cranston, Rhode Island, USA. Why urethane is the material of choice: Urethane has become the material of choice in so many of today's performance-drivenapplications because it exhibits extraordinary physical and mechanical properties that other materials simply can't match.In addition to being particularly resistant to abrasion, cutting, and tearing, urethane also demonstrates tremendous flexibility.Polyurethanes come in a wide range of durometers and densities too, which means that finished components can be softas a gum eraser or as hard as a bowling ball.