This is a complete Amaruk  XD frame.  This includes the center frame, all hoop pieces, your choice of engine mount, and a 10 or 16 liter fuel tank.
 
Not included are engine, swing arms, harness, propeller, and throttle.
 
Engine Compatibility:
-Vittorazi Atom 80 and Moster 185 (Plus, Dual Start, and Factory R)
-Polini Thor (80, 130, 190, 200, 202)
-Minari F1
-Corsair Black Devil and Black Bee 
-Air Conception Nitro 200 and Tornado 280
 
Swing arm compatibility:
-CNC Swan Neck Arms
-Stainless Steel Tubular Arms 
 
Harness Compatibility
-SOL Evolution 2
-Apco SLT
-Apco Spilt Leg
-Dudek power seat