Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information; 25 Pieces of different size,made of leather,designed for alto saxphone. Alto saxphone pads replacement, and replace worn and non-functioning saxophone pads with this complete set of good leather pads. They can be well-constructed to tight seals. Product Name:Alto Saxophone Pads Weight:46g include: 2 x pad (diameter 46 mm) 1 x pad (diameter 43.8 mm) 1 x pad (diameter 42.3 mm) 2 x pad (diameter 40 mm) 1 x pad (diameter 36 mm) 1 x pad (diameter 34 mm) 1 x pad (diameter 31 mm) 3 x pad (diameter 30 mm) 2 x pad (diameter 26 mm) 3 x pad (diameter 24.5 mm) 5 x pad (diameter 18 mm) 1 x pad (diameter 14.4 mm) 1 x pad (diameter 10 mm) 1 x pad (diameter 8.5 mm) colour:Black Material: PU leather Package Contents: 25 x Sax Leather Pads Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.