Designed for use with their G-11 HD Tripod, this set of three Losmandy Anti-Vibration Pads are used to dampen ground vibrations due to cars, foot traffic, or other sources to limit image shake when looking through a telescope eyepiece. Each of the pads is made of a photoluminescent material that glows in the dark for up to 15 hours to help you avoid hitting the tripod legs in the dark, and their 5" diameter ensures generous surface contact.