They are not marked so I'm assuming 20,000 based on dimensions in spec sheet. The item "Multiroll Multiton Swivel Top Machine Rollers Rigging Skates Set Four, 20,000#" is in sale since Wednesday, January 15, 2020. This item is in the category "Business & Industrial\Material Handling\Hoists, Winches & Rigging\Lifting Machine Parts, Rigging\Other Lifting Parts & Rigging".
The seller is "robbob1957" and is located in Broomfield, Colorado. This item can be shipped to United States.