What does the SI and HH stand for on wilson tennis rackets?

Question

and what's the difference between its values, low vs high?

Answer 1

HH is probably Hyper Hammer or Head Heavy. It's most probably Hyper Hammer if it is the racquet's name. SI means Swing Index. The Higher the SI , the lower powered the frame and vice versa.

Also, if HH is head heavy then that means your racquet balance is more tilted towards the head.

Answer 2

theyre just marketing tools

Hyper Hammer is what HH stands for but it really means that those racquets are head heavy (like a hammer)

I dont know about SI but if you're looking for power, the HH ones would probably be what you're looking for.

I can't say from personal experience how good t hey are but you can't really beat the low prices.

Answer 3

I think HH means head heavy, but I'm not sure what SI means.  The guy above who says Swing Index sounds right.