These are replacement tracks for and early model King Tiger. l'd highly recommend using these over the standard 1 piece tracks that come with the Tamiya kit. They're easy to assemble, just simply cut out from the sprue, and glue the required number of tracks (45 per side), allow to cure for about 20-30 minutes and then fix to the wheels or until they become as rigid as the kits 1pc tracks. Its best to let them fully cure overnight and to use a slower curing glue such as the Testor's liquid cement (red bottle) or the Tamiya regular cement (orange bottle). To get the proper 'sag effect' wedge a couple bits of rolled up tissue paper under the tank and tracks while the glue cures. My only complaint is having to cut each link out of the sprue before gluing. I'd much prefer it if they were like the Dragon Magic Tracks and already loose just to save time.