Comparison Chart: Weight 3.9 lbsBSN SPORTS™ Challenger Discus 1.6k 3.9 lbAmber Athletic Gear Prestige Discus 80% Galvanized Steel Rim Throw Discus with ABS Side Plates, Ideal for Training & Competition, IAAF Compliant, 1.6 Kg 3.9 lbsOfficial Black Rubber Discus 3.9 lbPort A Pit Olympic Wood...