The E-ring is an easy-to-use external overtone control ring which "floats" on the surface of a drumhead. It rounds out and flattens the drumhead's sound and allows for easier tuning.
Evans - 10" Clear Drumhead with Single-ply 10mil Film
Evans 10" Sound Off Tom Silencer Mute Pad SO-10
Evans RealFeel 12" Single Sided Practice Pad
Evans RealFeel 6" Single Sided Practice Pad
Evans 10" RealFeel Attacktile Practice Drum Pad Scholastic Pack EVSP-RF10G-AT
Evans 10" HD Dry Drumhead