... By Client's demond 3.Many standards available Product: glow in the dark o ring O ring is a kind of sealing ... is usually made of springing material and through the molding way to make it in the ring ship. It is generally used to ... , balance before shipmentMOQ1000pcsPackagepolybag and cartonSample lead time7 daysOEM/ODMwelcome Our company produce o-rings (o-ring), waterproof circle, rubber ring, silicon ...