SLACKiES are the official string of German manufacturer - iYoyo.
SLACKiES are the perfect fit for iYoyo yo-yos: they are slightly (~15%) thicker than regular poly strings, measure in at 115cm and are especially well suited for all of your slack and suicide tricks - hence the name.
The extra thickness doesn't feel bold at all, but offers that extra bit of response for yo-yos with a larger gap.
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