Conforms to IAAF specifications High grade composite materials JCL800 - 800 gm - 45 / 70 meters JCL700- 700 gm -40 / 65 meters JCL600- 600 gm - 35 / 55 meters JCL500- 500 gm - 30 / 45 meters JCL400- 400 gm - 25 / 40 meters Accurate weights and balances. Conforms to IAAF competition standards. Available in 5 weights.