Amazon.com : Tannus Unisex's Armour Puncture Round Protection, high Grip with Low Rolling Resistance, Easy Assembly, Reusable, Free tyre and Tread Selection, red, 20 x 4.0-4.8 : Sports & Outdoors
Tannus Airless Tires claims flat-free riding without the drawbacks - BikeRadar
Tannus Aither 1.1 Mini Velo Airless Tyre for Brompton – Condor Cycles