Philips genuine replacement shaving heads - comfort cut Works with: S512, S520,S530, S531, S550, S551, S560, S561, S570, S571, S575, S720, S728, S738, YS521, YS524, YS526, YS527, YS534, YS536 - Philips SH30/21 shaving heads for 2 head shavers - Designed and made in Netherlands - Replacement clickstyle.