Spring Loaded Casters - Durable, Heavy Duty, and Easy to Install!
4 Inch Heavy Duty Rubber Mute Spring Loaded Gate Door Wheel Caster 100kg Load Capacity Home Gate Door Roller Furniture Hardware - Furniture Casters - AliExpress
Spring-loaded castors for sensitive transport goods | Blickle
Aluminum Spring Loaded Caster Rolling Ladder | Platforms and Ladders
Yaegoo 2" 4" PU Gate Wheel Heavy Duty Spring Loaded Swivel Caster (2"): Amazon.com: Industrial & Scientific
4 Inch Light Duty Spring Loaded Swivel Caster - China 3inch Spring Loaded Caster, Shock Absorbing Wheels | Made-in-China.com