A quick and easy grip trainer for testing finger strength. Use the Carabiner lock and load pins to add weight, or simply use ropes and add weights. Print with a fill rate of over 35% to achieve optimal strength when lifting heavier weights. You can use a "fluffy outer skin" to increase grip strength, or keep it smooth for a more challenging test. This grip device is perfect for rock climbers or fitness enthusiasts looking to improve their grip strength.