A neat refillable box containing 225 rubber, O rings in 18 different metric sizes. They range from 3mm diameter by 1mm to 22mm by 2mm. Made of quality nitrile rubber, these O-rings are suitable for automotive and plumbing applications and more. When you need an O-ring, all you need do is remember where you put this box. Great value, much cheaper than buying small single size packs. The O-rings come in a handy plastic organiser box 210 x 110 x 30mm.