Seismic Encore Wheels 63.5mm x 42mm 81A set of 4. 32mm machine-ground running surface, Centerset bearing seat, Double-radius profile. The first wheel carefully designed from the inside-out for the rigors of modern Longboard Freestyle and Dance! Highly-optimized to withstand the extreme impacts of big Longboard Freestyle jumps. Unusually light for a wheel this size, with mass highly concentrated in the tire for enhanced momentum and angular balance.