This is a set of one YKK metal zipper slider and one top stop (as shown in image 1). Size: No. 5 This can be used when the zipper slider on jackets, parkas, etc. breaks. Last stock remaining. Normally, the front zippers of leather jackets like riders jackets use size No. 10, so please check before purchasing. As an exception, Aero Leather's half belts and Highwayman jackets use size No. 5 by default, so this should fit. Image 2 shows a half belt where the TALON zipper slider broke, and this product was used to replace it. The zipper tape, elements, and bottom stop are TALON, while the slider and top stop (the very top of the elements on the left side of the image) are this YKK product. Search YouTube for instructions on how to replace it. It's relatively easy and should be quick to do.