So, which of these have you already tried ?Aug 17, 2009. 11:31 AMrickharris says:Bike tire inner tubeAug 17, 2009. 9:11 AMthematthatter says:ive seen a few designs that used pantyhose.Aug 17, 2009. 2:58 AMKiteman says:Any rubberised (= high friction and non-conductive) material will work.I used to use a VdG with a ragged old belt held together with staples and wishes, and it worked fine.For a small generator, large rubber bands will work.I would be tempted to try cutting a strip from an old neoprene wetsuit or rubberised macintosh (the coat, not the computer).If you were feeling really creative, you could even try weaving a belt from ordinary rubber bands.Aug 16, 2009. 4:13 PMJoe Martin says:Just buy one of the proper width, We tried to make one but when I started it up it lasted all of 2 seconds.If you do try it's got to be: taught, flexible, strong and able to produce static.Aug 16, 2009. 7:09 PMJoe Martin says:It's like a big rubberband but a bit paperyAug 16, 2009. 4:29 PMorksecurity says:The big ones, I believe, just used standard conveyor-belt material (rubberized fabric). There's also the lazy solution: Look at the catalogs/companies which sell hobbyist VdG generators and see if they sell spare belts.