The good'old Master Airscrew black colored G/F series 11X6 is great for beginners because it doesn't always shatter if it just nicks the ground. Always keep some spares ready.

For better performance step up to the dark grey colored Master Airscrew S-2 series 11X6, but this one is more brittle with impact. This prop speed and engine load fits between an APC 11X6 and 11X5. In some sport/trainer applications the M.A. S-2 may actually exceed those APC props in performance.

APC makes excellent very high performance props, yet they are among the least forgiving of a minor prop strike.