This is a large replacement base for Wishbone Flip. It includes: Rail Left, Rail Right, Crossbar front, crossbar rear, 4 x side rail bolts, 4 x caster wheels, slide knob, knob bolt, latch and latch screw all put together.
NOTE: This does not assemble with Mini-Flip. The correct replacement base for Mini-Flip is Wishbone Mini-Flip Race Base available here.