This is made from 6061 aluminium.  It's been anodized silver for rust resistance.  Ready to use as is or paint ready. Same ones as can be seen here : https://youtu.be/-SHAIPjRjEI
 
Fits directly on the HPI savage K5.9 engine, LRP 0.32 spec 4, and other large sized nitro engines.  (but those 2 are confirmed.)
Might be necessary to trim the carb ventury, or add shims to make it fit.
 
Only 2x available.