yes they work i have a pair and use them in my basketball shoes they make you gain bwt 1-2 ich but only when you but them on somthing hard, i put them under my insole in my practise basketball shoes coz the have hard bottoms. unlike my AI pumps that are soft under the insole which mean they dont work as well

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"Give me the ball and ill carry the team"
stats:

Age: 15
Height: 6 foot
Weight: 163lb
Running vert: 30
Squat: 148 (326lb)
Deadlift: 138kg (304lb)

Novice weights stats

Starting:
Squat: 78kg (171lb)
Deadlift: 88kg (194lb)

End of Phase 1:
Squat: 98kg (216lb)
Deadlift: 105.5kg (231lb)

End of Phase 2:
Squat: 128kg (282lb)
Deadlift: 123kg (271lb)

End of Phase 3:
Squat: 148kg (326lb)
Deadlift: 138 (304lb)