F.A.S.T. stands for Fully Active Starburst Technology®, which is the patented technology that makes the F.A.S.T.® 201 so amazing. When you throw a F.A.S.T.® 201, you notice that its easy to throw, it spins fast, and it returns to your hand with ease. With three levels of adjustable response, you can tune your 201 for beginner to intermediate tricks. The F.A.S.T.® 201 is virtually maintenance free and perfect for anyone trying to master classic yoyo tricks!