The Mammoth Gear Set explores really really big hoops. This gear set measures 80 cm x 80 cm (31.5 inches) and comes in four quadrants that snap snugly together.
The Gears in this gear set are:
700/600 hoop
600/512 hoop
512/420 hoop
420/360 hoop
360 gear
128 (240/72) oval
100/75 hoop
75 gear
The dimensions of the big rings are:
700: 71 cm or 28 inches diameter
600: 62 cm or 24 inches diameter
512: 52 cm or 20.5 inches diameter
420: 43 cm or 19 inches diameter
360: 37 cm or 14.5 inches diameter