Replacement wheels for the Ripstik DLX Mini. Includes replacement tools, and comes pre-installed with the spacers and bearings needed for riding, so you can install them right away. We will adjust for smooth rotation and inspect the quality before shipping. 【Hardness】 With the same material, the softer the hardness, the more grip it has, but at the same time, the friction resistance increases, making it easier to wear down. Conversely, the higher the hardness, the weaker the grip, and the less likely it is to wear down. However, when comparing wheels made of different materials, it is not always true that harder wheels are less likely to wear down. There are also materials that are hard and brittle (easy to wear down), and materials that are soft and sticky (hard to wear down). Clearly inexpensive wheels are brittle, and the frequency of replacement increases, so the cost performance is not necessarily good. 【Wheel Rotation】 Wheels will always wear down due to friction with the ground. The way the wheels wear down differs depending on the rider's habits, but the "rear" and "inside" tend to wear unevenly, leading to instability. You can use them in a balanced way by regularly rotating the wheels front, back, left, and right to make them as even as possible. 【Highest Grade Bearings】 ILQ-11, which is two grades higher than the original ABEC7. While ABEC is an industrial standard, ILQ is a standard for skateboard bearings. The quality varies greatly even within the same standard, but we have combined speed bearings selected by a skater shop owner that rotate well and gain speed. We adjust the bearings before shipping, so you can enjoy a super smooth ride with no resistance. 【The Best Rotation Performance】 This is possible because the shop owner adjusts the bearings by hand, one by one! No matter how good the bearings are, they won't spin well if they are not adjusted. As a skater pro shop, we inspect and adjust the parts before shipping to ensure they spin at their best. There is a big difference in quality compared to products that are cheap but don't spin well. Please be careful for the sake of your children's safety and peace of mind. Product Details ●Product Name: Ninja Wheels ●Quantity: 2 (for one unit) ●Color: Red ●Hardness: 83A ●Size: 68mm (diameter) x 24mm (width) Same size as the original wheels ●Bearings: ILQ-11 speed bearings ●Not original wheels.