Perfect Manipulation Balls (1.7 Purple) by Bond Lee "The wait is over, come and experience the perfect manipulation balls." We devote ourselves to continuous improvements. After years of testing, we proudly announce that our new manipulation balls are ready. While having the goodness of the previous version, we made it even better: Better grip/ finish Great bounce 8 vivid colors available Made of high quality silicone Customizable Great value for money Basic routine tutorial included This is one of the finest set of manipulation balls you can get. Each set comes with 4 balls and 2 shells (except single ball/single shell) Two sizes available: 1.7" (45mm) and 2" (50mm)