Paxman introduced the Series 4 as the natural bridge between the Academy student horns and the professional-level instruments. It incorporates several features usually only found on top-level professional horns: detachable bell, water key (on mouthpipe), protective nickel hand guards and nickel silver valve casings. Made in yellow brass and paired with a medium large bell for a characteristically warm yet exciting sound. The wrap is based on a Geyer-style, which makes it a particularly free-blowing horn. The left hand position is adjustable by means of a movable thumb lever, to make it suitable for the younger player or adult.