Commonly referred to as 'square' bales, they aren't, and vary in weight from 40lbs up to a couple 100lbs or more. They are tied with twine, the larger ones with wire. There is a wide variation depending on the model of hay baler used. The hay is picked up by the baler from a windrow in the field, compressed and tied, coming out the back ready for stacking on a wagon. With an optional 'bale thrower', the smaller ones are thrown into a trailing wagon with high sides. This bale is roughly 42in x 22in x 18in high. 10 polys. Should work in TS2004 and TS2006 and maybe TS2009.