I recently tested inner tubing from bikes, not a very good slingshot band material. Unstretchy and slow. <br><br>But now I learned that until WW2, inner tubings were made from natural latex (the famous red stuff), until the shortages lead to a material called butyl rubber as a substitute. That substitude was then kept to this day.<br><br>Except that some high end guys are using latex again, simply because they believe that it is lighter and has less rolling resitance.<br><br><a href="http://www.sheldonbrown.com/tires.html" class="postlink" target="_blank" rel="nofollow">Read about the inner tubing history here</a> <br><br>So I bought the best stuff I could find (a whole 28" tubing set weighs less than 60 gramms = 960 gr) and it arrived today!<br><br>I immediately checked it out and it is VERY PROMISING. It stretches more far than TB Gold (about 65%) and feels more linear until the very end of the stretch. I banded a Panther up with 15cm effective draw, untapered. 5 kg draw! And fast. Probably the fastest tubular rubber I ever tested.<br><br><div style="margin:auto;text-align:center;width:100%"><a href="http://2.bp.blogspot.com/-48sL2G0W25g/TnjRODbyeoI/AAAAAAAAA5k/c--ecN_t0_Q/s1600/InnerT.JPG" class="postlink" target="_blank" rel="nofollow"><img src="http://2.bp.blogspot.com/-48sL2G0W25g/TnjRODbyeoI/AAAAAAAAA5k/c--ecN_t0_Q/s320/InnerT.JPG" border="0" alt=""></a></div> <br><br><br>As soon as I have some time, I will make a tapered butterfly set and test the heck out of it.