The quality of the urethane used for these wheels is durable and built for shredding. The small 52 mm wheels are your street setup for pop and good balance. Whereas the medium-sized 53 and 54 mm wheels will serve you as an all-arounder for street, park and small ramps. The hard and longlasting Toy Machine wheels with a hardness of 100A are great for maintaining speed and solid trick landings.