I had these blades before and were very good so i ordered new ones for my HK550TT - DFC heli. And yes these are good for FBL - there is little or no leading or lagging... Only downside is black color, but some bright yellow or white tape to make disc more visible in air can solve this...
byefor this price one can not complain,needs balancing,and one of them is not 100pcnt straight.
but packaging,HK why sqeeze 550 blades in a 560mm box.luckely they arrived undamaged.good stuff
tracking perfect no balancing needed
but the upper half of the blades is not exactly glued to the lower part
but no problem in flight. good perfomance. ok for 3d
keep em coming thanks hk