Remo has built drumheads in the United States since 1957, and the company exists because Remo Belli solved a problem every drummer before him simply lived with. Calfskin heads changed pitch with humidity, went slack in damp weather and had to be dried under a lamp before a performance. Replacing skin with Mylar made a drumhead that held its tuning anywhere, and it changed what drums could do. Nearly every significant head design since, from the Pinstripe to the Powerstroke to Sub Muffl Technology, has come out of the same company. The Ambassador is still the most widely used drumhead in the world, and the catalogue builds outward from it through the Emperor, Pinstripe, Diplomat, Controlled Sound, Powerstroke and Emperor X series in coated, clear and Ebony films. Beyond heads, Remo makes world percussion on its own seamless Acousticon shells, which do not crack and are unaffected by humidity, including the Mondo Djembe and the Valencia Tubano. Rototoms, marching heads and the drum circle range round it out, and the education and music therapy side of that range is used in school and clinical programs worldwide.