The Nero flat end button is a practical choice for many reasons, particularly for the comfort of the player, the attractive concentric rings, and the stability and imperviousness of the Nero material. Figaro fine fittings are made only from the best sourced materials and finished by hand by craftsmen in a family owned business. The Nero material is made in the USA from eucalyptus paper and thermosetting resins. It is pure black and mimics the finest Madagascar ebony. It is hypoallergenic and not susceptible to humidity or temperature change. The surface is impermeable to sweat and body fluids and therefore very easy to clean. There are no parts available that are superior!