Resin strap, exactly the same as the original. They are flexible when new, but over time (> 1 year) they dry out, become stiff and break easily. My original band lasted a little over a year before breaking up. A complete Casio watch is only $25, and a replacement strap is almost half that of a new watch. Someone might consider buying a brand new watch. The hardest part was the installation. Tools are not provided. I had to use a jeweler's screwdriver to properly install the spring pins, which proved very difficult. I knew exactly what to do, but the construction of the strap closest to the watch case is so tight that it was almost impossible to bend the strap. I managed to get the group installed, albeit with some curses along the way.
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