Seismic Focus Wheels 55mm x 38mm 97A set of 4. 26mm running surface, Offset bearing seat, Double-radius profile. The Focus is the most advanced wheel on the market for modern flatland freestyle skating. Ultra-high-grade urethane carefully formulated for an optimal balance of grip and slip, plus the perfect form factor to prevent nut bite during edge tricks. Awesome for all-purpose street skating, too!