- 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/3.35inchx5.12inchPackage Includes:1 Rowing Machine Webbing Rebound DamperNote:Please allow slightly errors due to manual measurement and different monitors.