Part A is a cylindrical part from the hip joint, Part B is from the foot and Part C is one of the detailing part put all over the body. All the parts are made of FRP (fiber reinforced plastic) coated with urethane on the surface. The detailing part is made of acrylic resin, with urethane coating on the surface as well.
The 3 decals are from the forearm and leg it seems.
The earning from the auction will be donated for charity purpose. It has started since yesterday (August 16th) and will end next week, on August 23rd. Successful bidder will get the 6 items, plus a special certificate.
The current bid (August 17th, 10.45AM) is 211,000 Yen. ^^
Images are from Yahoo! Japan Auction.