Wraps Per Inch Tool (with yarn weight grooves) - for measuring the thickness of any yarn. Wrap the yarn into the inch-wide notch and compare the number of times your yarn fits in the slot with the key, or estimate by which groove corresponds to your yarn
WPI Singles - this wraps per inch tool has grooves to measure the thickness of your single plies when spinning
Cats Per Inch - the WPI tool, with 100% more cat
Approximate Size: 2.5" square; cat is 4” x 3”
Because they are made of a natural material, the appearance of each tool may vary slightly.
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