Tannus Armour Tubeless inserts are the result of years of top level multi-cell foam manufacturing mixed with extensive professional riding experience. At the heart of Tannus is the patented Aither Technology; a multi-cell foam compound that forms the structure of the Armour. The inserts are designed to displace small impacts while offering a spring-like rebound for a smooth yet playful ride.3% Faster than standard tubeless Flexible sidewall stabilizing "Wings" for smoother ride quality with 50% more vibration damping 20mm of rim protection Not a sealant sponge – keeps sealant where it belongs Easy Installation (5 Minutes No tools required) 150g - About as much as a standard tube (a little lighter)