The so-called 'unbreakable' props. These are made from a very soft compound that gives resilience in crashes.
This size prop is appropriate for 220x size motors running 3S and 4S in the 2000-2300kv range. Check your motor temperatures on 4S if you're using a lower quality motor or running sustained full throttle.
Contains 4 props (2 CW, 2 CCW)