Check the listing for details. Adscope 641 Sprague Stethoscope Color Violet. Condition: New. Listed at 19.99 USD. The Adscope 641 Sprague features:Threaded chestpiece drum of chrome plated zinc permits the use of five interchangeable chestpiece fittings - an adult and pediatric diaphragm, and three bells (1 1/4", 1", 3/4") - for complete diagnostic capability on most patientsDouble tube configuration, not made with natural rubber latexProprietary valve mechanism eliminates acoustic leakageAdjustable aluminum binauralsConvenient 22" tubing length in 31 model optionsComplete with an accessory pouch containing the bell chestpieces, chestpiece key, 2 spare diaphragms, one pair of hard eartips and one pair of soft clear eartipsWeighs 7 oz.Overall length 30"Inspected and packaged in the U.S.A.Chestpiece Type:ConvertibleChestpiece Material:ZincChestpiece Finish:Mirror/SatinChestpiece Weight:3.5 ozChestpiece Weight(gm):99.2 gDiaphragm Diameter:1-1/2" (1")Diaphragm Diameter(cm):3.8 cm (2.54 cm)Diaphragm Material:PVCDiaphragm Type:StandardBell Diameter:1-1/4" (1", 3/4")Bell Diameter(cm):3.2 cm (2.54 cm, 1.9 cm)Headset Type:External SpringHeadset Material:AluminumHeadset Finish:AnodizedTubing Length:21"Tubing Length(cm):53 cmTotal Length:30"Total Length(cm):76.25 cmTotal Weight:7.04 ozTotal Weight(gm):200 g