This listing contains 89a Durometer Inline Wheels. These wheels are perfect for outdoor skating, and utilize the standard size 608 bearing hub. The 89a Durometer rating provides a long lasting, rock hard feel. For that reason, 89a is the most popular outdoor durometer rating. The added longevity of a harder wheel gives you more bang for your buck. If you are looking for a wheel that rides a little smoother, check out wheels with a durometer rating of 86a or lower. Wheels with a harder durometer rating will feel less smooth but last longer. Listing Includes: Qty x8 Wheels, Measuring 76mm in Diameter, and 89A in Hardness. Do you need bearings, spacers, oil, or a hop up kit? Make sure to check out our eBay store for accessories you may need!