Dovo Shavette blade holders attach easily to the shavettes, and house disposable blades for close, comfortable shaving. Red: This insert accepts standard double-edge blades which are snapped in half thereby doubling the economy factor. This is best for detailing of beards and moustaches. We also recommend using Derby Professional Single Edge Blades Green: This is a longer blade then the red insert but it holds a blade that has a ridged back. This blade is preferred for long term shaving. We recommend using Hair Shaper Blades for Green Inserts.