set of four, 10mm, steel spacers i had made for my r12 i think, could have been the 8, they are a tad heavy but may suite someones purposes, with it comes one only 6mm spacer from a 16ts i found a pair in one, only got one now tho, $60 plus post, very handy for a noisy dog next door on occasions, you can make out you were playing fetch.