A Hotrod is a bundle of smaller sticks that have been bound together to create a larger stick.
The ends of the rods can be left open to provide a clicking sound. The degree of 'click' can be changed by sliding an O'ring down the body of the stick, restricting movement of the individual sticks.
The hotrod tends to bring out bass tones mostly. It is heavier than a solid stick however and therefore playing complex patterns at speed is made more difficult by momentum.