1.MAXIMUM STABILITY PERFORMANCE Made from high quality leather, this double end punching bag is durable and can withstand even the most intense use. It is designed to be tear resistant. 2.Adjustable elastic rope for adjustable rebound speed and tension: The elastic ropes allow you to easily adjust the tension and rebound speed of the bag to your training style. This feature is particularly beneficial for those who want to increase their training intensity. 3.IMPROVE REFLEXES, SPEED HAND EYE COORDINATION Whether you are a boxer, MMA fighter, or just want to improve your fitness, this boxing reflex ball is perfect for improving your reaction time, timing and accuracy. 4.Versatile and easy to install in any room: This speed bag is lightweight and easy to assemble, so you can train at home, in the gym or in any available room. Whether you have a home gym or a professional training facility.