The 5-Star plugs do come out and there is a rubber seal although i've not done the task.
The material is aluminum, probably 6061, often referred to as Billet Aluminum and they are clear anodized on the Warrior and color anodized on other Yamaha sports bikes
The calipers are also anodized and because of the high silicon content of the casting & the anodic process used will turn dark. Check my response to this thread,
Rear Brake Bracket Paint Question:
http://www.rswarrior.com/forums/topic.asp?TOPIC_ID=38014Here's another recent thread that's interesting,
front caliper leak help!:
http://www.rswarrior.com/forums/topic.asp?TOPIC_ID=48930I ended up passing several pm's to
topgun and it turned out that the seals weren't reinstalled [:0] and a tool was ground from the end of a flat file to fit into or across the star.

It was my curiosity of what type of tool was used to remove the plugs that attracted my attention and follow up to the post.
A special thanks to
CBRMat for sharing some proprietary information that i passed on to topgun