Rubber ‘O’ rings to create an air and watertight seal between materials or objects. Suitable for sealing gaps between two surfaces. Includes assorted sizes from 4.2 x 7.2 to 15 x 23mm. Handy storage case with compartments. Multiple applications from plumbing to watch repair. Rubber ‘O’ rings to create an air and watertight seal between materials or objects. Suitable for sealing gaps between two surfaces. Includes assorted sizes from 4.2 x 7.2 to 15 x 23mm. Handy storage case with compartments. Multiple applications from plumbing to watch repair.