Chalice-shaped chest piece featuring dual-frequency diaphragms on both its sides. Offers perfect acoustic performance, diagnostic versatility and easiness in the handling of patients of various body types and ages. Better audibility of high-frequency sounds to help learn about patients condition. Paediatric side converts to an open bell. Open bell stays clear of dirt and debris by covering it with the small diaphragm. Dual-lumen tubing combines two sound paths in one tube, eliminating the rubbing noise of traditional double tubes. No natural rubber latex or phthalate plasticisers are used in the tubing or any other component.