The Harper Nylon Hand Truck was the first in the market to offer composite glass-filled nylon construction which equates to unbelievably low weight and high load capacity. Nylon material offers strength equal to steel or aluminum 10-inch wheels in pn eumatic or solid rubber600-pound capacity means this truck is cut out for the heaviest loads Frame snaps together for quick and easy assemblyThis hand truck is proudly made in AmericaReplacement Pneumatic and Rubber tires are available for purchase ( 10" wheel with 5/8" axle bore)The Nylon Hand Truck is portable tough and easy to use