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Triangular trolley wheels - good workmanship: Each part of the trolley is carefully designed, ensuring overall quality and durability; sturdy casters. Stair-climbing trolley - durable: The adoption of a special triangular running wheel design effectively reduces wear when climbing stairs and over slips. Trolley casters - triangular rolling wheel: Reduces friction during use, significantly extending the lifespan of the trolley/wheelbarrow. Sturdy wheels - portable and lightweight: The wheels are medium-sized and can be quickly stored, very convenient for use, especially for climbing stairs. Replacement trolley wheels - low noise: The trolley wheel design reduces noise during use, providing a more comfortable storage experience.