Durable steel construction for long-lasting performance - Built with steel to deliver reliable, durable operation over time and through regular use. Double-layer spring design for high load capacity and smooth ride - Features a dual-layer spring to support heavier loads and effectively absorb shocks, resulting in a steadier, more comfortable ride. Simple, robust structure with high strength - Main body is a spring with a steel shaft axle, designed for high strength and strong resistance to breakage. Efficient shock absorption for foldable bicycles - Combines effective shock absorption with a foldable bicycle design to improve control on varied road surfaces and provide a comfortable, stable riding experience. Use scenarios - City commuting on rough pavement and potholes: reduces rider fatigue and enhances comfort during daily trips. - Recreational rides on mixed terrain: performs well on gravel or uneven surfaces, improving handling and stability. - Everyday use on foldable bicycles: enhances ride quality during urban travel and compact storage rides.