Magliner Gemini Senior with microcellular foam tires The Magliner Gemini Sr. Convertible Hand Truck changes from 2 to 4 wheels in seconds for a larger load capacity and more maneuverability. Equipted with 10" puncture-resistant microcellular foam tires. They never go flat and performs like a pneumatic tire but doesn't require air! (Click Picture For More Info...)