If you tend to break a lot of props then get a Master Airscrew. They are quite tough and can usually divet out grass without breaking. I hate wood props because they are more expensive here and the slightest touch against anything will instantly break the prop. APC props are not quite as tough as the MAS but they are pretty close. They are also more efficient because they are stiffer and don't flex. The best prop choice will depend on what plane its going on. For my planes I found that a 11-5 prop either MAS or APC works really well. It lets the engine rev up well and a bit quicker than the 11-6 and gives me good speed and the bit lower pitch gives me lots of climb. [8D]