Each coil consists of all colors in that particular mix, held together by a rivet.
25 coils per pack. Dimension listed is the diameter of coil laid flat.
For an approximate yield - a single large coil (sizes are large & jumbo) should fill a shopping bag with dimensions of 8" x 4-3/4" x 10-1/2".
As with all filler type product (including shreds) actual yield can vary significantly depending on how much product is fluffed up or packed down.