Sonic XTRA 215 ~ Rigid Material BLEM The Sonic XTRA 215 is a fast flyer that is pet friendly and great for beginners. This disc weighs in at approximately 90 grams, making it one of the lightest dog discs currently available. The Sonic XTRA 215 is made with a special polymer blend giving it greater durability and grip. Three time UFO World Cup Champions, and Quadruped National Distance Champions Maggie and Matt DiAno are reporting longer throws and catches with the Sonic. Now available for purchase and custom hot stamping.