It's a massager.
Spikes get into the muscles and break up the tight and clumped together bits.
Push out the lactic acid and recover faster.
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Item: Body Hand Foot Spiky Massager
Function: Point Foot Pain
Size: 6.30" x 2.76"
Fits the description, has not yet been tested. Thank you
A second time, All is super! THANK YOU VERY MUCH!