The plastics are Yamaha's YSP plastics I got from Japan. They made them around 2008 and were special edition. If you broke a piece or needed a ysp plastic you had to turn in the old one to get a new piece, they did not sell just the plastics and made very limited number. I still try to find more by watching Japanese auction sites, but hard to find and getting crazy expensive for used pieces if you do find some. thanks