Hi man! Today i think bout have changed my slingshot approach! I've used for 1 Years the famous thera band gold, 2 x side, 30cm lenght and tapered fork/pouch 1/2. Great power, about 80m/s (Chrony) for a 9g steel ball. But i was so frustrated because after 30-40 shot the bands started to tear. SO, ABOUT 1 WEEK ago i decided to change and pass to tubes, today the package arrived to my home. I get 7,50m of thera band red tube! I started to build my first home mad slinghost and ladies and gentleman hear that: - 1 tube per side - 30 cm tube length (135 cm draw-lenght about... 4,5X stretch factor, fulll butterfly, of course) - 1,4g pouch weight I shot 5 times and i got a medium speed of 80 m/s! the same like the bands! I shot other 10 times and tube seems to be the same (no tear). SO, IF TUBING LAST MORE THAN BAND, i've found a easier to make, cooler, same performance and last more slingshot system! I think that now, tubing are like bands! Of course for quite light ammo like the 13mm steel ball. My next step will be a doubled per side tan tubing.