This is a Yamaha Blaster 200 reed spacer kit - these are 5/16" thick
These go right up against the cylinders and the carb boots.
Includes all 4 allen head stainless steel bolts
and also includes all gaskets required for install (most on eBay to NOT include these)
This spacer helps with the carb clearance problem associated with using a larger carb, where the clutch arm hit the bottom of the bowl.