Training Undercarriage 250-450 Size : AF-TRAININGUC450Universal Training Undercarriage suitable for all 250-450 size helicopters such as:Align T-Rex 250 to T-Rex 450Blade 230OMP M2 to OMP M4...and many more similar in size...

Deluxe Helicopter Training Undercarriage 30/60 (550-700)

Hirobo Safety Skid Set : 0402-818Made for the Hirobo Shuttle, but could be used on most 550-600 sized helicopters