"The Pro Advantage Sprague Stethoscope features a double-tube configuration for improved stereo separation as well as a patented chestpiece valve stem which delivers outstanding acoustics. An accessory kit contains five interchangeable chestpiece fittings - an adult and pediatric diaphragm, and three bells (1 1/4\", 1\", 3/4\"), deluxe eartips, and a chestpiece key. 22\" tubing length. Five year warranty. Latex free."