Pictured is the Guarneri style GelRest, shown here mounted on a typical Guarneri style chinrest. Fits both violin and viola. The peel-and-stick adhesive makes it easy to install, but it also stays securely in place and can be removed easily with no residue. To clean, spray any mild, streak-free cleaner on a soft cloth, or paper towel, and wipe and wipe off. Like most adhesives, the GelRest adhesive lasts longer if it is not removed too often, so clean in place as often as possible. Now you can transform a hard wood chinrest into one that feels comfortable, and looks good too.
Not sure which chinrest you have? Measure it and compare with these dimensions: 105mm long X 65mm wide.