Description: - Brand professional rubber Cups - Fits most trucks. Keep Longboard/ skateboard trucks flexible - Skateboard may or lose its toughness if Cup too hard. And it too cause the skateboard to be difficult to control. These Cups Fits Perfectly with the Skateboard Truck - Material: Rubber - Diameter(5): approx 16*10 mm - Diameter(7): approx 18*12 mmPackage Includes:2 Pieces 16×10 mm Cups2 Pieces 18×12 mm Cups