http://www.hbmichu.com/sealing-element/o-ring-box/
Yellow O-ring kits is a kind of sealing package,O-rings can be used in static or dynamic applications where there is relative motion between the part and the O-ring. Dynamic examples include rotating pump shafts and hydraulic cylinder pistons. The packaging of O-rings is also diverse, among which the Yellow O-ring box is also widely used. It looks simple and beautiful from the appearance, and can accommodate various types of O-rings. No matter in which field it is applied, it will be very easy to use.O-ring Box manufacturers
website:http://www.hbmichu.com/sealing-element/o-ring-box/