Please note: Your original tubing shape should resemble the item image. Otherwise, it will not fit your bell. Tubing: latex free, single lumen. Ear tubes: Chrome finish / Interchangeable with original soft sealing eartips Y position to diaphragm - about 21 inch. Eartips to diaphragm - approx 28 inch. fits All Littmann Classic models, Select, Lightweight, Pediatric, and Infant Kindly examine the product image to ensure its appearance is compatible with your model for a proper fit.