This kit is designed for a Honda TRX450r all year models . We use cork style friction plates which are proven to be very durable. Smooth steel plates & springs that are 10-15% stiffer than stock. One of the durability keys to our clutch kit is the smooth steel plates. "Dimpled or textured" steel plates WILL NOT handle as much H.P. or last as long as smooth steel plates. "Dimples" are concave in shape which reduces surface material causing less contact area which results in premature clutch slippage. We also add one extra full size friction plate to this kit so you have the option of removing the judder spring and seat and replacing it with a full size friction plate. This combination gives you a little more contact area and helps with premature clutch slippage caused by higher H.P. engines or severe riding conditions. This kit still includes the larger I.D. friction plate that is needed to use the judder spring and seat if thats the combination you prefer.