correction：360+ L4 & Aux L4 does share same gromments，the racket head's hole position isn't same maybe because the racket head shape is different 个更正：新老L4共用一个护线管，只是颜色不同，线孔位置不同可能是因为拍头形状不同
it's still very hard to translate our lesson video for now，cuz it's takes lot of time to do it，and i am the only one that charger all the videos production，translation，upload，filming，editing，talking，scripts writer，but i will try to find somebody help me to do translation in our future tennis lesson videos.
the L# naming system is how Head used to refer to rackets by power level. The lower the number the higher the power. So L3 is Extreme, L4 is Radical, L5 is Speed, L6 is Prestige
