Monadnock AutoLock® X3™ Heavy Gauge 21" Baton:
The Monadnock AutoLock HG (Heavy Gauge) baton features a larger diameter shaft that increases the strength of this baton. The Super Grip® handle provides an excellent surface for the user to maintain control of the baton against pulling and twisting. The ribbed material enhances grip in both wet and dry conditions. Like other AutoLock batons, this retracts with the ease of a push button.
Built well, feels good in the hand. Expensive, so I expect it to last forever.