To our valued customers, We are experiencing an issue with many customers not pressing the evaluation button after receiving their packages. Please remember to press the evaluation button. Discounts are not offered. Price negotiations are not accepted. The color of the flat cord cannot be chosen. As you can see, this is an original triple knock machine (shuttles not included). It allows you to take out 3 shuttles at once, increasing the efficiency of your knocking practice. There are similar products on the market, but mine is the original, so please don't be mistaken. m(__)m While single-tube and double-tube versions are made by anyone and everywhere as "original," mine is the only knock machine that can simultaneously release and hit three shuttles. The officially sold ones are expensive and heavy, so I made this original version. Mine is lightweight, with the tube weighing around 310g. The tube can hold 60+ shuttles. With each shuttle weighing 5g, 60 shuttles would be 300g, making the total weight around 610g. I am also a coach, and I use this machine with elementary, junior high, high school, and corporate teams. It's well-regarded for being lightweight, which is beneficial for smaller children, as heavy equipment can be a burden. My students say it's very easy to use, as they carry it themselves, and they've even won championships in junior high school district tournaments and the block tournaments above that. The skeleton design allows you to see the contents easily. Refilling the shuttles is also easy. The length is 54cm-55cm (handmade). The longer the tube, the more it moves, making it difficult to use, so I've made it this length. The length of the flat cord is adjustable, allowing it to fit your body and prevent the tube from moving, making it easy to use. This is an original knock machine that can be used by children and adults. Available for purchase. YONEX, Mizuno, Wilson, Prince, Li-Ning, Gosen, Black Knight, Apacs, Badminton, Shoes, Shuttles, Rackets, Wear