In our opinion this hand down the BEST modification for the Hummingbird it is simply a must have. No more messing with broken skids broken struts and even mounting the battery pack is made simple. No Super Glue assembly ( all mounting hardware is included ) and these retrofit landing gear are simply close to indestructible. The kit is supplied with built in mounting systems for both lithium and NiMH Packs using the lower front built in clamp. The struts can bent all the way to the ground without breaking. Note that this is a CNC machined Delrin part and NOT molded plastic ( higher strength and quality ). We love this upgrade and highly recommend it !!!