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When we are using discs we often come across such inconvenience: when it lies flatly on the table, it is too thin to pick up without effort. Now we have made a loop of fillister on the interior wall of the groove to solve this problem.
We redesigned the disc on the premise of not changing its original shape, so it will still function normally.
Guangqian Li,Minjia Wang,Haoyu Zheng, Shan Guan,Lei Li