May I ask why dont you just get one 10mm? Its not necessarily great to stack spacers on top of others if thats what you're thinking. Not to steal away anything from Keoki either, but you can get 5mm anywhere on the web for cheap.
the 15 spacers are 90 one dollers.just ditch that dirty ole 10mm spacer and get a 15mm single. the price is probably just about the same as the 5mm. and you have the security of single chunk, not stacked. hell i dunno.
this sauce im eating with my **** is FANTASTIC and i dont even know what it is.
edit: r.i.c.e. the new acronym for **** . R_I_C_E who woulda thunkit