The PRO kit it's a real indispensable accessory that you need to prepare your racing body; the kit is Universal, it fit all the 1/8 On-Road bodies on the market.

The PRO kit include:

an ultra rigid rear pre-cut wing with plastic screw/nuts to fix it at the body

a complete polycarbonate stiffeners set in different sizes (short, medium, long for the sides of the body)

a very long single stiffener (for the rear area of the body)

double-sided tape to fix the stiffeners at the body

instruction manual