Huge and soft. Probably getting you all hard right about now. The OJ Thunder Juice 78a Blue Wheels are too good to be true. Best juice around, you can roll all over with these. 78a and 75mm. The Thunder Juice Wheel is solid. Available in colorways as seen below. Sizes available as seen below. Colors are limited to specific size. See colors below for correlating size. Wheels sold in set of four.