The listing is for a set of four (4) service caster series #20 casters, four (4) swivel bolt hole casters with posi lock brakes, 4” diameter by 1-1/4” wide polyurethane wheels. Supports a total weight of 1,400 lbs (350 lbs/per caster).

Listing is for one (1) Service Caster Series #20 stainless steel swivel caster with a 4" diameter by 1-1/4" wide phenolic wheel and a 12mm-1.75 X 1-1/2" metric threaded stem with total lock brake capable of supporting 300 lbs./caster.

Electric Tricycle for Adults, 500W48V Folding Electric Trike, 20"x4.0"Fat Tire 3 Wheel Ebike ,Step-Thru Aluminum Frame with Push-Button Reverse, Large Basket for Women Men

Listing is for a set of four (4) service caster series #30 swivel casters with 4" diameter by 2" wide polyurethane on aluminum wheel and maintenance free precision ball wheel bearings capable of supporting a total weight of 2,800 lbs. (700 lbs. per caster).

This product is high-quality, affordable, and very durable.