No relation to the 66H of old (a small bore "pea shooter"), this new model is a large bore (0.547) intermediate/semi-pro level horn with a traditional wrap F attachment and rotary valve. Features include: • 0.547 large bore. • 8-5/8 inch rose brass bell. • Standard wrap F attachment. • Rotary valve with traditional string linkage. • Medium-width slide (4-7/16-inch). • Brass outer slide tubes. • Single radius nickel slide crook. • Chrome plated inner slide tubes. • Bach 6.5AL mouthpiece with gold plated rim, inner cup & backbore. • Woodshell case. • Full warranty. • Made in USA at Conn's Eastlake, Ohio plant. Similar to the professional 88H model, the 66H is ideal for advancing players wishing to start playing a quality large bore instrument. The large bore gives a fuller, darker sound than that of small or medium bore instruments, and as such is ideal for band and orchestral work. The medium wide slide is similar to many professional models, but is easier to handle for younger playes and those without large hands. -cdp