These are anti-perspirant hand lotions and powders to help you keep a tight hold on your squash grip.
Lotions
Dry Gel
This is an anti-perspirant gel you can rub on your hands to prevent them from getting too sweaty.

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Reviews
My friend CJ told me about this. Here’s what he had to say:
For me this stuff has been great. It totally changed my game when I stopped worrying about losing control of the racket head
I tried it myself and honestly did not notice much of a difference. I will have to give it another try and see how it goes.
Carpe
This is also an anti-perspirant hand lotion.
Wilson Progrip Max
Powders
Tourna Rosin Grip
This appears to be more of a powdery substance to help with traction on your grip.
Yonex Grip Powder 2
Another powder:
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