NKD Hollow Air is a great and best selling wheel for your trick scooter. The wheel comes in two different sizes, standard 110 mm and 120 mm. We use the absolute best and purest MDI PU on the market on our NKD wheels. In this way, we ensure soft wheels that are at the same time insanely durable. The wheels ensure softer landings, smooth driving and maximum service life. The small hexagon inside the wheel is made and designed to minimize weight. The core material is made of strong materials such as Aluminum 6061 T5 to ensure that it can withstand tricks and ramps. With these wheels, you are guaranteed a good quality wheel with included and installed ABEC-9, K1000 F1 Perfomance ball bearing, which ensures your ride is smooth every time. NKD Hollow Air is a quality-conscious wheel that ensures good durability for a lot of tricks. The wheels are sold individually and come in several different colors so you can put together and find the color that best suits you and your scooter.