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Synergy caps size1 these fit the Hitman Axiom and the X-Convict these simply snap into the side of the yoyo to replace the stock caps. they add the ability to hold the yoyo by the sides essentially the same as the yoyofactory hubstacks but with different technology

Synergy caps size 3 fit the larger size yoyojams including dark magic meteor and speeders etc

I have read on a forum that there is an issue with vibing with the caps fitted i have found that ensuring the caps are snapped into place properly is the answer

Great fun way to add something special to you yoyojams sold in pairs