Excellent durability and performance, with high-impact ABS side plates and steel rims. Competition Discus features 73% center weight which allows users to develop strength, control, and technique. Better suited for beginner and intermediate throwers. Super Discus features 80% steel rim weight allowing throwers to further develop correct technique and establish correct flight path. Ideal for advanced throwers. Higher rim weight will help to reach new distances only when force and technique are applied correctly by more advanced throwers.