STREET X-Ninety-Seven 53x31 V5 Sidecut X-Formula 97a white About: The amazing new X- Formula™ (XF) is another industry leading innovation from the BONES WHEELS factory. X-Formula rolls over rough terrain like softer wheels do, but slides much like a harder wheel will. Speed: X-Formula™ is extremely fast because it has a super high rebound. X-Formula rolls much smoother and faster on all terrains because it absorbs vibration and softens impacts much better than any other wheel in the market. Grip & Slide: The slide-ability comes from its unique blend of high performance materials. X-Formula will slide when you ask it to, and grip when you need it most. This is because X-Formula is specially formulated for any terrain. It has been developed over a ten year period to optimize performance and fine tuned to perfection. X-Formula is very unique product Durability: X- Formula™ is smooth, fast and durable. It has been developed using the highest quality, longest lasting materials. X-Formula is a great value and because it softens landings and absorbs vibration, it is also better on your body which can add longevity to your normal day of skating. These wheels will change your life! Satisfaction Guaranteed All BONES WHEELS manufactured products are warranted against manufacturing defects for the useful life of the product. If you feel your skateboard wheels, bushings, or other BONES WHEELS products were defective, you may send it back to us, freight prepaid. We will inspect it and let you know of our findings. If we decide your returned product was defective or failed to give reasonable service, we will replace that product with a similar, available product of the same or better quality and pay for the shipping back to you. You can send in multiple products to be inspected for your return. We will evaluate each product separate and will replace any and all products found to be defective. About BONES WHEELS Product Performance: Many skaters assume the performance and quality of skate wheels are all the same. A wheel is a wheel is a wheel, they might often say. That's actually not the case. In fact, very large differences exist between the raw materials, manufacturing process, quality control and performance of different wheel brands. Up until now though, a wheel's reputation has been a combination of market hype, market muscle, skater support and word of mouth. Bones wheels popularity is largely a result of superior quality, performance and durability. Real Value: BONES may not be the lowest-priced wheel, but our abrasion test chart shows why Bones is the best value. After all, what good is a cheaper wheel if it flat spots the first day? BONES wheels offer the best combination of product performance, durability, quality, and customer service available today. In other words, you might be able to find a lower price, but never a better value. Our Strength: All BONES WHEEL unique formulas are solely developed and produced in our own manufacturing plant located in Santa Barbara, CA. Using drastically different physical and engineering properties for each formula, BONES creates unique urethanes for specific applications of skateboarding.