Skateboard Parts SECTOR 9 DD 70mm 78a/90a YEL/BLU (Set Of 4) Review May 3, 2018July 13, 2018 GiantPandaisy 0 Comments Outdoor Recreation, Sector 9, Skateboarding, Skateboards & Scooters, Skates, Sports & Outdoors SECTOR 9 DD 70mm 78a/90a YEL/BLU (Set Of 4) NOTE: Wheels sold in sets of 4 only.