【Premium Material and Design】: This Rowing machine spring box webbing rebound damper is made of durable ABS, featuring a woven belt design that provides great elasticity and rebound. It offers stable damping effects, making your rowing action smoother. 【Versatile Fitness Equipment】: Suitable as a replacement part for rowing machines, it can provide various training modes and choices to meet personalized fitness needs. 【Hydraulic System】: Equipped with a hydraulic system that allows you to adjust the hydraulic resistance, this retractor simulates real rowing actions, increasing the difficulty and effectiveness of your workout. Size 8.5cmx13cm/3.35inchx5.12inch. 【Spring Box Gravity Wheel Design】: The spring box and gravity wheel design offer multiple resistance modes suitable for different training levels and goals. It also features a pulley design to reduce friction, making the pulling rope smoother for increased comfort during workouts. 【Automatic Adjustment System】: Some parts come with an automatic adjustment system that adjusts resistance based on training intensity and speed, ensuring continuity and stability in your workout routine. Size Chart: 8.5cmx13cm/3.35inchx5.12inch Package Includes: 1 Rowing Machine Webbing Rebound Damper Note: Please allow slightly errors due to manual measurement and different monitors.