As file name says experimental track....much stronger thank you would expect....100% printed snap together no separate pins, easy print. was inspired by my cable chain design. at this moment I have not created a drive wheel for these... but each link has two drive lugs one on each side. I also created an asymmetrical version in both left and right if someone wants wider tracks but wants suspension in closer to the body. I will get drive and idler wheels done... and have printed all of the tracks and checked fit.... a note, links are very tight,,,,soak in hot water before linking or they may break. when I get printer fixed will do wheels for these.printed on mendel soaked tracks in very hot water then snapped together closing with pliers then let cool. not for the 45mph basher good for the yard and house cruising slower bots tanks....ect... very strong for such a simple design