Capacity up to 150 pounds per caster. These casters have a low initial cost. They were designed for intermittent usage ( light duty ) on manually moved equipment, rolling on smooth floors, in applications where there is no abuse. The swivel has a double ball bearing. The gray soft non-marking rubber wheels provide floor protection and quiet operation. The polyolefin wheels are best when loads are to be left parked for prolonged periods. You may want to consider our caster Model 3. It represents a better return on your investment because it provides higher capacity, easier rolling, longer caster life and a wider selection of wheels.