Dunnett R Class Res-O-Tone drum heads represent a subtle but completely new approach to the traditional drum head. While working with Remo to develop the new Felt Tone bass drum heads, Ronn Dunnett advised a simple, unique and original head design using Remo films. The Res-O-Tone drum heads are based on the Remo Ambassador model blended with Dunnett's proprietary film combination (patent pending). The result are heads that produce unmatched resonance, have a broader tensioning latitude and have fresh sonic and kinetic characteristics. " Tympanica" is how Dunnett describes them. They also have an uncoated Timpani film and a unique semi-transparent finish. The image shows 2 drum heads, however only one head is included.