4inloveme Magic YoYo N11 Professional Butterfly Metal Aluminum Yo Yo Toy Ball for YoYo Games 1A 3A 5A Black 1. You can use this yo-yo for trick 1A, 3A, 5A. For advanced player in competition and daily practice Made of aluminum alloy that allows for stable and balanced high speed routines The wing shape of the dash makes string tricks easier Improving players' coordination, flexibility, and strength