Sold as Set of 3 Caps. Outside diameter .758", this size was generally used on the bass, treble, balance and power knobs. Does not include knobs. The JTNS Products replacement Pioneer SA Style Knob Cap is a replacement for the original pioneer fluted side knobs. Our caps are stamped from solid brass and beveled on the edge with a stamped indicator pointer like the originals. Please note that they are more yellow than the originals as the original material is no longer available (see photos). If that is something that is not appealing to you the solution is to replace all the caps so that they match and then sell the originals to recoup some of the cost.