Giotto 57mm Professional FreeStyle Wheels provides a very high quality wheel, which is used on many types of skating surfaces including standard wood floors coated with plastic or poly urethane, but also unusual surfaces like tile type basketball and volleyball courts, tennis courts (Indoor or outdoor), and concrete or terrazzo surfaces that are more common around the world. These are low-profile, durable wheels that are strong, light, and with extremely close tolerances for roundness, trueness, and for the Cage where the Bearings and Spacers are mounted.
The softer the wheel, or lower Shore “D” hardness number, the more the grip and slightly less roll. The harder the wheel, or higher Shore “D” number, the more the roll, with slightly less grip.