Description: 50 Pieces premium rubber various standard size scuba diving O ring plastic box, lightweight, wear-resistant, durable and long lasting Commonly used for dive equipment, BCD's, regulators and hoses Great for your tank valve, and air hoses Works well for underwater cameras, pressure gauges, dive lights or other diving gear Great repair replacement accessories for your worn rings Specification: Material: Rubber Hardness Durometer: 90 Color: Black Quantity: 50 Pieces Size Chart: Size/Scuba Application/Quantity Size 003 1/16" High PressureHose/ 5 Pieces Size 010 1/4" Low Pressure Hose/2nd Stage Reg/Cylinder Valve Stem 5 Pieces Size 011 5/16" Low Pressure Port/Hose,Hose Adapters 5 Pieces Size 012 3/8" High Pressure Port/Hose,Gauge Hose 5 Pieces Size 013 7/16" Large Low Pressure Port/Hose,Piston Seat Seal 5 Pieces Size 014 1/2" Standard Yoke/Tank Regulator 5 Pieces Size 015 9/16" High Pressure Hose/ 5 Pieces Size 111 7/16" Small DIN Regulator Valve 5 Pieces Size 112 1/2" Standard DIN Regulator Valve 5 Pieces Size 116 3/4" Small Tank Neck, 3500 Cylinders 5 Pieces Package Includes: 50 Pieces Scuba Diving O Ring Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks!