Atom Boom HP Wheels Hollow Core Wheels XFirm Grey *Light weight (59 x 38 Nylon: 83 grams)(59 x 38 Alloy: 86 grams).Available in 3 sizes and Two Different Hubs 59x38mm XFirm Grey 62x38mm XFirm Grey 62x44mm XFirm Grey FREE Atom Wheel Bag and Free Devaskation Tool Bag with Purchase..