Check the listing for details. ADC Proscope 670 Dual-Head LightWeight Stethoscope COLOR Black. Condition: New. Listed at 12.99 USD. The Proscope™ Dual-Head combines lightweight construction with truly affordable pricing.The Proscope™ 670 features:Combination diaphragm/bell chestpiece for wide-frequency responseLightweight aluminum chestpiece constructionNon-chill bell and diaphragm rims for patient comfortDiaphragm diameter 1 3/4", bell diameter 3/4"Proprietary diaphragm enhances acoustic response by 50% over traditional designsAdjustable aluminum binaurals with PVC eartipsFlexible 21" PVC tubing is made without phthalatesChoice of 20 tubing colorsWeighs 3 oz. (85.6g) Overall length 32.25" (81cm)Inspected and packaged in the U.S.A.Chestpiece Type:CombinationChestpiece Material:AluminumChestpiece Finish:AnodizedChestpiece Weight:1.3 ozChestpiece Weight(gm):37.5 gDiaphragm Diameter:1-3/4"Diaphragm Diameter(cm):4.45 cmDiaphragm Material:PVCDiaphragm Type:StandardBell Diameter:3/4"Bell Diameter(cm):3 cmHeadset Type:LightweightHeadset Material:AluminumHeadset Finish:AnodizedTubing Length:21"Tubing Length(cm):55.5 cmTotal Length:32.25"Total Length(cm):81 cmTotal Weight:3 ozTotal Weight(gm):85.6 g