The Ultimate Support TS-99B Lift-Assist TeleLock Speaker Stand are extraordinarily strong yet lightweight due to its over-sized heavy wall aluminum tubing. They're everything you'd expect from an Ultimate Support speaker stand - they're strong, sturdy, lightweight, 100% field serviceable, and easy to set up and take down. However, the TeleLock collar gives the user the ability to safely raise or lower the stand WHILE a speaker is on it thanks to the Auto-lock technology that securely grips the telescoping tube in place as you set its height.