Having a spare link in your saddlebag can be the difference between stranded or being able to repair a broken chain on the spot. The KMC Missing Link-10R Reusable Card of 2 is compatible with KMC and Shimano 10 speed chains. This pack includes two pairs, so you’ll have more than enough in case the worst happens in the middle of your next ride. You can use the KMC Missing Link-10R Reusable Card of 2 with new chains or keep in your seat bag for an emergency repairs