Pucks are used to connect the Mosko Wedge Mount or Scout 25 Pannier Plate to your rack. This kit serves up a pair of replacements or spares. It includes 2 blue pucks, 2 elongated washer plates, and 4 bolts. In other words, the 2-Puck Pak is a quarter Puck Sak. Now say that three times fast.
I have several bags from of Mosko they are tough, went to Baja last November and went down several times, once real hard. They took the beating no rips or busted straps, easy to lash additional things on. Customer service has been great very responsive. I wish they were a bit bigger for my everyday to and from work riding. Its easy to tighten up the straps for a small load but hard to stretch out for a bigger load. Hard to fit my work backpack into paneer a bit tight so I switch back to hard panders when I am at work.