i wouldnt even entertain looking at them its not worth it when you can get a trusted brand for a little more money. NGK, DENSO, although ive had a few NGK plugs let me down. not just in the R but in some of my old cars & motox bikes when i raced them, but i stick with DENSO plugs now as ive never had a fault with them. but may try NGK bcr8es next as they seem to be favorate for the R.
And also if there made out of cheap metal which they will be as there cheap ebay jobs id always be worryed about the tip snapping off with the heat or something. then it is game over :doh: