So I just got a few tubes of shuttles brought to me from china, supposidly one of the better brands, anyways there are two types, one's supposidly indoors the other is supposidly outdoors. feather ones btw. There's a red circle at the top corner, on the indoor ones it says "402A" on the outdoor ones it says "401A" i'm not sure if these numbers are important. What is the difference between the two types? Thanks!
