Dual Sliders : Two-way Separating (Dual Separating) / Head-to-Head Closed Bottom (Dual Closed) - Metal, Coil, Satin, Vislon(Molded)

Two-way, closed head-to-head zippers are those where the sliders meet together to close the zipper. This zipper does not separate. 

Two-way, separating zippers are those used in applications where you can open the zipper from the top or bottom.

All kind of zipper by YKK. Conceal, Vislon, YZip, Lining, Regular Coil, Separated Bottom, Two Way Bottom, Special (AquaGuard, Metallion, Metaluxe, Satin, Soflex) with MANY  Color options.

YKK have three main categories of zippers: Coil, Metal and VISLON®.Coil zippers are made of spiral plastic elements such as polyester and nylon. They are soft and versatile and can be used in anything from apparel garments to luggage or sporting goods to automobiles. Metal zippers are made of metal teeth that are clamped onto the tape. They are strong and durable and can be used in jeans, jackets, boots, etc. VISLON® zippers are made of injected plastic elements such as polyacetal resin. They are lighter than metal zippers of the same size and can be used in outdoor gear, luggage, etc.

Cosed End Bottom - Conceal(Invisible), Metal, Coil, Vislon(Molded), YZip(Jean)

Check out YKK zippers with the best quality here.