Features:The material of the assorted tiny o-rings is rubber, they can be applied for a long lasting time and you do not worry about its durability.These assorted o-rings are good for repairing watches, mechanical equipment and more.These o-rings are put in 12 compartment according to different sizes and you can find the size you need easily and quickly, which will help you save time when you apply and replace them.Storage by categories. The tiny o-rings set comes with a plastic rectangle box, easy to arrange the storage by categories and convenient to apply.Compact and light weight, easy to store and won't take up much space.Specification:Condition: 100% Brand NewMaterial: RubberColor: BlackSize: 1.4mm (0.6 x 0.4) 1.45mm (0.65 x 0.4) 1.5mm (0.5 x 0.5) 1.5mm (0.6 x 0.45) 1.6mm (0.6 x 0.5) 1.6mm (0.6 x 0.7) 1.7mm (0.7 x 0.7) 1.8mm (0.8 x 0.5) 1.9mm (0.9 x 0.6) 2.0mm (1.0 x 0.5) 2.4mm (1.4 x 0.5) 2.8mm (1.8 x 0.5)Package Weight: Approx. 35g Package Included:1 * Watch Crown-O-Ring