The MDUSA Low Spin Discus has strong side plates made of extremely hard ABS plastic. The steel rim is chromed with a rim weight of 78%. This discus is perfect for all beginner and intermediate throwers. The Low Spin Discus meets all IAAF standards and we guarantee that it will make weight at any contest or we will issue a full refund. ABS side plates are guaranteed from breaking in normal throwing environments for 2 years.