This adds some fore/aft stiffness to the ZX6 and adds a lot of torsional stiffness. This helps prevent the center driveshafts from dropping out of the diff or slipper drive cups. These are designed for the rear motor position NOT the forward position, choose our HD version for that option. The Stiff deck is made from glossy 2.0mm glossy carbon fibre, the Stiff option being for higher grip surfaces. This is a replacement should you break one, also available as an overall kit KY307. Price is for ONE front deck only.