i wanted my bushes all the same colour as it looks nice when everything matches.and i hate yellow.i wanted a purple set and was told thats what i would get.if its just a dye the manufacturers put in when making it then surely its not hard to make them all 1 colour.i know it matters how hard a certain bush is but the bushes are all different and only fit on a certain part of the car so they dont have to be different colours to denote hardness,as i personally dont need to know or care as im sure the company im buying from have done their research and testing and have decided how hard or soft a paticular bush needs to be before going to market with them.as for cheaper bushes i have never heard of anybody having a problem with any poly bush,cheap or expensive.