This hollow 10mm replacement endpin is very nicely made by Weidler in Germany. It's stiff and durable, but removes a lot of the mass from the endpin, which some luthiers recommend for tonal improvement.
The plug (the part which inserts into the bass endblock) is made of a durable, "crack-proof" composite (synthetic - not wood) and is 34.5mm tapering to 27.9mm. The shaft itself is 10mm, is 44cm (17.25") long, and has a removable heavy-duty slip on rubber cap over the non-threaded point. The Super Endpin Ball that we sell would fit well, and would make for a splendid upgrade.
These endpins are quite nice; the shaft is not highly polished, so it has a pleasing "brushed metal" vibe. Looks quite "money," if you ask me.
NOTE: The endpin has a retaining "rivet" installed at the inside end of it. This prevents the endpin from fully removing from the plug assembly. If you ever intend to use a bass wheel with your bass, you will likely want to use a file or grinder to remove that small bar/rivet, so that the endpin can be removed from the bass once installed.