This item is for those who are either adding onto or starting over or staring to build a HO scale layout, 100 3' or 36" pieces of Atlas code 100 flex track is enough to get a layout started or completely finish a layout, 300' of track at your disposal, that a lot of track!!!! This is enough track to make a large loop around a Union Pacific BIG BOY once with about 16 feet of track to spare. Needless to say, this is a lot of track!!!! To put it in perspective, the WMT HO layout is 4x8' and uses 13 3' lengths of this track, think of what you could do with 300'!!! And with 4 boxes of 100 pieces of track available you could make a long stretch of track over 1200' long, which is 200 feet longer than 8 Union Pacific big boys end to end..