This is the original YYF Red Line Grind Monster and Red Alert Grind Master with the teflon coating. If you’re looking at this then you know what these are.
Grind Monster: The yoyo is near mint, has 2 tiny marks on the Grind Monster cap rim, so small they dont show well in the photos. Has box. $250USD not including shipping.
Grind Master: The yoyo has 2 small marks which I’ve tried to capture in the photos. The box has a tear. Response pads and replacement bearing seats are included. $200USD not including shipping. Happy to answer questions and send more photos.