DescriptionSector 9 – Nineball Purps – 61mm x 78aSector 9 Nineballs have been a long-time favorite of skaters from all walks (dont walk, roll.. ha ha) of life. From cruising to freeriding, we’ve got something for everyone in this collection. All these wheels provide great roll speed and come with either a factory finish for a little extra grip before you slip or stone ground pre-broken-in for easy slides.Details Size: 61mm Durometer: 78a Contact Patch: 32mm Round Lips Centre SetSet of 4 wheels.