1. 2.Made of practical rubber/fiber/, heat resistant, durable and reliable. 3.18 different sized washers stop leaks and seal fittings 4.Essential plumbing assortment and business 5.used for faucets valves plugs and pipe and fitting connection Size: Rubber seals: 10pcs: 4x16x4mm 10pcs: 4x17x4mm 5pcs: 8x14x4mm 5pcs: 8.5x18x4mm 5pcs: 9.5x17.5x4mm 5pcs: 10.5x14x4mm 10pcs: 12x24x2mm 10pcs: 15x24x3mm Fiber seals: 10pcs: 10x13.7x1.8mm 10pcs: 11.5x17.5x1.2mm 10pcs: 17x21x1.2mm 10pcs: 17x24x1.2mm 10pcs: 20x25x1.2mm 5pcs: 27x33x1.2mm seals: 10pcs: 12x17.5x2mm 10pcs: 17x24x2mm 3pcs: 27x38x2mm 3pcs: 30x39x2mm Material:Rubber and fiber and Colour:Red and black Package Contents: 141 x washers Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.