Features: 72mm wheels are designed for reliable performance at a greater value 72mm/SG5 bearings/6mm spacers 72mm/80A wheels are replacement value wheels for most kids skates Easy replacement SG5 Bearings and Spacers SG5 silicone/grease helps limit friction and increase speed Wheel kit includes: (8) 72mm wheels, (16) SG5 bearings, and (8) 6mm spacers preassembled for replacing wheels