Is your Zinger Winger Hunt Tester (G4-Silver) not throwing your training aids as far as it used to? If so, replacing the rubber tubing with this kit will fix that. The virgin rubber gives you the force needed to throw those heaviest birds or bumpers at a jaw dropping height. The length of time the bird sails through the air is enough to make the steadiest of dogs break. Comes with all the tubing (precut to the optimal length) and zip ties you need to get your Zinger Winger Hunt Tester G4 throwing like new again.