Features: This 279 pieces assorted O-ring set is perfect for automotive, commercial and hydraulic use. Features with 18 kinds of the most used sizes to accommodate a wide variety of tasks. Constructed of premium rubber, these rings will resist heat, oil, gas, water and most silicone fluids and solvents. The o-rings come in a labeled and organized storage case which makes it easily to choose the correct size. This is a great o-ring set for any auto mechanics and machinists. Specifications: Condition: Brand new and high quality Material: Rubber Color: Black Weight: 200g O-Ring Size and Quantity: As the following picture shown O-Ring Quantity Size(internal diameter * thickness) 20pcs 3 * 1.5mm 20pcs 4.4 * 2mm 18pcs 5 * 2mm 23pcs 7 * 1.5mm 23pcs 10 * 1.5mm 23pcs 13 * 1.5mm 13pcs 19 * 2.5mm 14pcs 21 * 2.5mm 13pcs 22 * 2.5mm 10pcs 18 * 3.5mm 10pcs 20 * 3.5mm 10pcs 22 * 3.5mm 14pcs 10 * 2.5mm 13pcs 11 * 2.5mm 14pcs 13 * 2.5mm 13pcs 14 * 2.5mm 14pcs 16 * 2.5mm 14pcs 18 * 2.5mm Package Included: 1 * Kit of 279pcs O-Rings 1This 279 pieces assorted O-ring set is perfect for automotive, commercial and hydraulic use 2Features with 18 kinds of the most used sizes to accommodate a wide variety of tasks 3Constructed of premium rubber, these rings will resist heat, oil, gas, water and most silicone fluids and solvents 4The o-rings come in a labeled and organized storage case which makes it easily to choose the correct size 5This is a great o-ring set for any auto mechanics and machinists