ISF Resistance Bands in sizes as follows.  Use for a variety of exercises where bands are required.  

Grey 4" wide
Orange 3.5" wide
Blue 2.5" wide
Green 1.75" wide
Purple 1.5" wide
Black 0.75" wide
Red 0.50" wide
Yellow 0.25" wide

Our 4 Band Mega Set includes the 4 biggest bands only.  One of each: Grey 4", Orange 3.5", Blue 2.5", Green 1.75".

Our 6 Band Set includes all but the bigeest and smallest.  One of each: Orange 3.5", Blue 2.5", Green 1.75", Purple 1.5", Black 0.75", Red 0.5"

Our 8 Band Set includes all sizes.  One of each: Grey 4", Orange 3.5", Blue 2.5", Green 1.75", Purple 1.5", Black 0.75", Red 0.50", Yellow 0.25"