這是悠九推出的不鏽鋼弧形軸承，它用手去撥動就可以持續轉三十秒以上。他內、外圈是不鏽鋼的，可以預防生鏽的問題，保持器也是不鏽鋼的，滾珠一樣採用最高等級的十顆小滾珠，而目前滾珠的材料暫時列為機密，跟一般市面上的材料不一樣，也不是陶瓷滾珠。外圈也進行鏡面拋光處理，可以讓你在做花式的時候更加滑順。
This is the special stainless steel bearing by Yonity. It can keep spinning over 30 second by hand. The materiel of retainer, outer race and inner race are stainless steel. So, there are no rusty problem. The roller is the high-class 10 balls set. But we can not tell the materiel of roller. It is the secret why it can spin so long. The outer race has been polished. The polishing finish makes it smoother when you doing tricks.
