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RADFACTOR It is the original spinning ball. (It is a special ball for turning on your finger which is often seen in basketball etc.) Although it is a spinning ball which had been sold from various manufacturers all over the world until a few years ago, manufacturing and sales have been discontinued in recent years, and the circumstances difficult to obtain have continued. At RADFACTOR, we responded to requests from many customers, repeating research and prototyping for sale, finally completed the spinning ball of wish! Conventional spinning balls can only be stably rotated only at two sides of the air hole and on the opposite side, so that only two of them are prone to wear. The RF spinning ball can be rotated stably anywhere 360 ​​° if it is on the molding line (part of burr). Therefore, there is no chance that only one place will be sharpened, and the service life is much longer than the conventional spinning balls. Because there is an air injection port, if there is a commercially available air inlet for soccer ball etc, air pressure adjustment is also possible. Please try RF spinning ball by all means. ★ About delivery status, wrinkles Unlike the RF spinning ball, this spinning ball is shipped from the factory in a state that it is folded out of air, and folding jaws are attached at that time. Since it will be shipped in the folded state even when delivered, prepare a commercially available air pump. Although it is difficult to completely extend wrinkles, it is possible to extend slightly wrinkles by putting it in hot water of about 40 to 60 degrees. ★ About the lame of the surface This spinning ball we use a large amount of lame. This lame may adhere to various places during use and storage. We will ship after removal of the surface lam as far as possible, but we can not remove all, so please be careful when using or storing. Diameter : Approximately 19 cm to 25 cm Weight : Approximately 400 g