I just received a couple of sets of Master Airscrew 3DR props (4 props per set - 2 silver, 2 black). I haven't flown them yet, but thought I'd post a quick tip for those who might find matching props to shafts a bit confusing.
First things first. Lay the stock 3DR props next to the Master Airscrew props and you'll see the leading/trailing edge matches. Note, the Master Airscrew prop profiles have a slight flange at the tips (presumably to apply more lift).
Once you've determined the black/silver prop matches, flip the silver Master Airscrew props over. Then take a silver Sharpie and paint the inside collar. Do this now and it'll save you time and confusion when mounting the props in the field.
I'm looking forward to testing the Master Airscrew props. They look much more aggressive than the stock 3DR props and I've read that they provide better performance and quieter flight. I'll post more after I test them.