@sinz54 @AbraarKaran If haven't used either of them, but you probably need 9210+, which uses elastic straps. The rubber straps are much tighter. (I've noticed this comparing the 8210 to 8210+.)
@sinz54@AbraarKaran如果没有使用其中任何一个，那么您可能需要9210+，它使用弹性带。橡皮筋要紧得多。（我注意到这一点，将8210与8210+进行比较。）