Molded storage case included (419) professional quality O-rings Inside diameters from 3mm-50mm Not for use with gasoline Assortment Includes: QTY - ID x OD x Cross Section (20) - 3mm x 6mm x 1.5mm (23) - 7mm x 10mm x 1.5mm (23) - 10mm x 13mm x 1.5mm (23) - 13mm x 16mm x 1.5mm (20) - 4.4mm x 8.4mm x 2mm (18) - 5mm x 9mm x 2mm (14) - 10mm x 15mm x 2.5mm (13) - 11mm x 16mm x 2.5mm (14) - 13mm x 18mm x 2.5mm (13) - 14mm x 19mm x 2.5mm (14) - 16mm x 21mm x 2.5mm (14) - 18mm x 23mm x 2.5mm (13) - 19mm x 24mm x 2.5mm (14) - 21mm x 26mm x 2.5mm (13) - 22mm x 27mm x 2.5m (10) - 18mm x 25mm x 3.5mm (10) - 20mm x 27mm x 3.5mm (10) - 22mm x 29mm x 3.5mm (10) - 23.5mm x 30.5mm x 3.5mm (10) - 25mm x 32mm x 3.5mm (10) - 26.5mm x 33.5mm x 3.5mm (10) - 28mm x 35mm x 3.5mm (10) - 30mm x 37mm x 3.5mm (10) - 31mm x 38mm x 3.5mm (10) - 33mm x 40mm x 3.5mm (10) - 34.5mm x 41.5mm x 3.5mm (10) - 36mm x 43mm x 3.5mm (10) - 38mm x 45mm x 3.5mm (10) - 41mm x 48mm x 3.5mm (10) - 44mm x 51mm x 3.5mm (10) - 47mm x 54mm x 3.5mm (10) - 50mm x 57mm x 3.5mm