f was a broken duplicate of the Plastic Balisong in Regretevator, which was accidentally added to an update, overwriting the Plastic Balisong and making people unable to use the Plastic Balisong until it was removed and the Plastic Balisong added back. People who purchased f might receive a different item in the future, however for now f simply reverts into coins. VIP players gain 150 coins instead of 135 coins in refund.