These Spacers are for UN-Boosting your boost frame. As with all parts these are Made In The USA. The set of two will add width to your 12x142 hub. You will need to either space out your brake caliper or space out your disc rotor. There are solutions available from Syntace and your local bike shop.
* Please check with your manufacturer to make sure this doesn't void your warranty as with any installation we recommend be handled by a professional bicycle shop.