ST Racing Caster Blocks (1Pr) - B5 & B5M These are the ST Racing CNC Machined Blue Aluminum Front Caster Blocks for the Associated B5 and B5M.Features:Blue coloredMade of aluminum CNC machined for increased durabilityFor the Associated B5 and B5MIncludes:Two ST Racing CNC Machined Blue Aluminum Front Caster Blocks, (2)Requires:Installation onto vehicle