Specification Brand : Sanmum BulletPoint1 : Premium material: made of high quality rubber, durable, wear-resistant and corrosion resistant. BulletPoint2 : What you get: including 500pcs new o-rings gaskets with 10 different sizes from 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, to 40mm, and 50pcs each size. BulletPoint3 : How to use: Rubber gasket set that is installed on the watch back case,can cover the gap between the watch band and movement. BulletPoint4 : Application: Replacement O-Rings for Watch play role in watch waterproof, suitable for watch repair and DIY watch maker. BulletPoint5 : 100% Satisfaction Guaranteed: If you have any questions or have a wonderful idea about our product, you are always welcome to contact us by e-mail, we will answer you within 10 hours. Color : 0.9mm wire dia. CustomerPackageType : Standard Packaging ExternallyAssignedProductIdentifier1 : 730718500119 ExternallyAssignedProductIdentifier2 : 0730718500119 ItemName : Sanmum Set of 500pcs O Ring Gasket Rubber Seal Washers Set Watch Gaskets kit Replacement O-rings for Watch Back DIY Repair (0.9mm wire dia.) ItemPackageDimensions_Height : 21.7 centimeters ItemPackageDimensions_Length : 1.9 centimeters ItemPackageDimensions_Width : 17.8 centimeters ItemShape : Round ItemTypeKeyword : watch-repair-tools Manufacturer : Sanmum Material : Rubber MetalType : No Metal Type PartNumber : 2020011401 Pattern : Solid ProductDescription : Description: Material: Plastic Wire Diameter : 0.7mm; 0.8mm;0.9mm Inner Gasket Diameter : 31mm,32mm,33mm,34mm,35mm,36mm,37mm,38mm,39mm,40mm (Each Size 50 Pieces) Rubber watch gasket set that is installed on the watch back case,can cover the gap between the watch band and movement Play role in watch waterproof, suitable for watch repair and DIY watch maker Package Includes: 500 Pieces Watch Gasket Kits Note: Since the size above is measured by hand, the size of the actual item you received could be a slightly different from the size above. Meanwhile, please be reminded that due to lighting effects, monitor's brightness / contrast settings etc, there could be some slight differences in the color tone of the pictures and the actual item Style : Modern SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 54111501