That's an old pic, and most of those were damaged when I got em, I still have Some parts and pieces.

The plastic props are J U N K [:'(] they will Sling Blades off without hitting Anything But Water and High Speed[X(] They are also Generally a lower pitch than the Metal Props, The blades Flex under a load and Loose Thrust, you never get one very sharp,, I can go on,, But I won't

The metal prop Will Break a blade off "IF" you hit something Hard at High RPM's but Generally they Curl an edge or something when you hit something BIG, if you keep it Sharp and Balanced it will perform and last 10X more than the plastic blades.