Solid tire, 12x2.125 size (sometimes called 12 1/2 x 12 1/4), circular honeycomb construction. Advantages include puncture-proof operation and no-need-to-inflate maintenance. Honeycomb tire engineering provides the reliability of a solid tire while also contributing additional shock absorption and suspension characteristics during operation. Commonly used for E-bikes, E-Scooters and general E-mobility.