Alliance Synthetic World Athletics Approved Discus 1000gSPORTLAND WORLD ATHLETICS DISCUS SYNTHETIC If you are looking for a professional discus, look no further than the Sportland World Athletics Synthetic Discus. These discus feature a strong steel rim with a durable ABS plate. Available in 4 different weights with a high rim weight of 85%, these discus have a higher spin rate but require more force when thrown making them the perfect choice for professional level of play. Approved by the World Athletics,