Full-size paddles are 3/8" AR500, and 6" diameter; suitable for common pistol calibers, but NOT rimfire. A rimfire round is not powerful enough to push the full-size paddles from one side to the other.
Rimfire paddles are 1/4” AR450 and only 4" diameter. These paddles are not intended for anything more than .22. If you shoot these paddles with 9mm for example, the paddle can swing too hard and bounce back to the same side; sometimes the light paddle with jump out of it's socket.
Availability: Normally ships in two days, but you should check the 'Shipping Delay Notice" on the front page of the website, since springtime is very busy.