PSA means Pressure Sensitive Adhesive. They are self-adhesive sanding discs that immediately and simply attach to some sanding device. Out there in possibly fabric backing or paper backing with cloth staying used for large obligation grinding and paper being a more reasonably priced and light-weight option for lighter sanding/finishing. Be https://www.facebook.com/permalink.php?story_fbid=pfbid02Hgmz8zuLm6mqA9py8zUbainbsmHUNbdzmecarw3dpFeDcdaid57MkSGkKajkmWfwl&id=61562415773754&__cft__[0]=AZU2rG8HvRAjlU5mHzYL-gLKu_eLiuBintGzwUtIPCfGMfscbIVbatoKCnLExPKDaT2kKtLRaLSzrHhJ3gOMRkiMTl1t94RZbnqtNHWqKr0dXU34JRIwQFxkhKOdbN0SgbUH-msFuf-RpN5KxSSmAZx7VDY40xDsf8PSMYlMKl1PqyJExFRf9PEMFP5JDSb5HV39A8IuC8dxbWY-vdmoNtp8&__tn__=%2CO%2CP-R