What does it do?

The Square Hoops gear set includes many large non-circular gears as well as some small prime number gears.
The four biggest gears are:
180 (square), 180 (triangle), 160 (octagon), 160 (square).  Each of these has a medium sized non-circular gear cutout.

This gear set is ideal if you want to use more large non-circular gears and rings.  It pairs well with the Compact gear set or the Full Page gear set; either of which will provide lots of gears to roll around in the non-circular cutouts.  To use the non-circular gears in a ring you'll want an enormous gear set; like the Enormous Hoops gear set, for example.  For more details on why that is the case you can check out this explanation.

Buy the Square Hoops gear set:

Shop listing for the Square Hoops gear set.

Photo:

Parts:

Parts in each quarter of the Square Hoops gear set:

• 180 square (270/90) with 120 square (180/60) cutout
• 120 square (180/60) cutout with 60 cutout
• 60 with 44 oblong cutout
• 60

• 160 square (270/60) with 136 square (180/90) cutout
• 136 square (180/90) cutout with 60 cutout
• 60
• 19
• 17

• 168 triangle (270/60) with 120 triangle (180/60) cutout
• 120 triangle (180/60) cutout with 60 cutout
• 60 with 30 cutout
• 41
• 37
• 30

• 160 octagon (270/60) with 120 octagon (180/60) cutout
• 120 octagon (180/60) cutout with 60 cutout
• 60
• 31
• 29
• 23

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The gear set frame is 40 cm x 40 cm (~15.75 inches x 15.75 inches) and is cut into four 20 cm x 20 cm parts.