Stock props are aluminum. That prop is stainless.
Looks like the clearance is tight on the left side, but there's a big gap on the bottom. The stainless sleeves warp some. That gap getting too big will start loss off power followed by cavitation. Also, when one part of the stainless liner bows out, another bows in, which causes the prop to drag the liner and wears the edge of the prop. If you have a large gap and your prop is dragging the liner, you may what to consider getting a new liner put in (I got mine for $300, I did it because I was putting in a newer prop I didn't want to drag).
Also tho, getting a new liner for a worn down prop may give you other clearance issues, resulting in a need to get the prop refurbished. No harm in running it the way it is if it's working ok, just some things to consider.
You should be able to turn the drive shaft and look b/t the blades towards the back of the prop. Skat-trak props are labeled neat the back of the prop.
Right now I have a 10/18 Skat and it's too small. The motor revs faster than the boat moves, and the boat continues to accelerate even after the motor has stopped reving. Should have a SXR prop soon.