Urethane cutting edges offer superior abrasion resistance, reducing impact felt in the cab compared to steel edges. Genuine STB13801 BOSS edges feature the BOSS logo as a wear indicator for easy replacement. Reversible urethane edges provide double the wear time, ensuring durability in harsh conditions. They are compatible with Toro models 74529, 74523, 74527, 72523, 72529, 72524, and 72530.