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Customizable Medium Type / Single Ball Bearing Black High Elasticity Natural Rubber (ER) Flat Free Tire Caster Wheel. High Elasticity Rubber: Made of imported natural rubber for excellent shock absorption and wear resistance. Ultra-Quiet Performance: Frosted sand wheel core and high-quality bonding ensure silent operation. Flexible Ball Bearing: Single ball bearing structure allows flexible rotation and extends service life. Customizable Options: Color and material can be customized to Black and Natural Rubber. Strong Load Capacity: Supports a maximum load of 150kg with durable zinc-plated surface treatment. Multiple Sizes Available: Available in 3-inch, 4-inch, and 5-inch specifications (75mm, 100mm, 125mm).