Features: *Professional substitute of springs for quick launch of the hub *Made of qualified 304 stainless steel, with excessive strength and excessive elasticity *Necessary equipment for bicycle hubs *Used to efficiently confirm the strength of the short launch and stop the quick release from loosening *Very appropriate for bicycle front and rear brief release forks, hollow axle forks, axle fixed rods, etc Specifications: *Size: as proven *Material: Stainless metal Package contents: 12* Quick launch string spring