This is our New GZR HS-1 stainless steel prop. This prop is great for a big block Mono, Cat or select Riggers. These are made exclusively for us at Gizmomotors. As racers ourselves, we know what our customers want, so these are ready to race or play right out of the box. No one else has a prop like this at this price. Quit paying premium prices when you can get more prop for less.These are a very limited edition get them why you can.