The rotary-valve trombone 'ROUND ABOUT V4' from BRASSEGO is fabricated from gold-brass and has 4 Valves. Because of the use of very light machine, the 4 valve trombone is not much heavier than it's 3 valve brother. The construction type is long and the instrument has a short and a long tuning slide. The instrument is delivered with the patented Singing Bell hammering.