端蓋 | 打造自己的滾珠軌道，或擴充它！

My kids kept knocking the caps off the track ends during play, but these snap on tight enough that even a full-speed marble collision doesn't budge them. The set of two is exactly what I needed to finish off both sides of our wall setup, and now the run feels properly complete.

These little caps snap right on and finally make the end of our track look intentional instead of just stopping mid-air. We bought a second pair just to extend the run into a longer loop, and they held firm through a dozen crashes.

The end caps snap on snugly and give the whole track a much cleaner look at the finish line. My kids' last run actually stays together now instead of the ball popping off the end.