WPI Specification -- Clearly marked and calibrated gauge is convenient for you to check your yarn sizes quickly determine the WPI rating by counting the number of yarn wraps per inch or laying the yarn along the black strip until you find a match Measurement Size -- The gauge is 1.6x3inch(4x7.5cm) the yarn wraps per inch area is 1inch(2.5cm) wide while including 8pcs measure bar slots coming in lace 18 fingering 14 sport 12 DK 11 etc each slot is 1mm deep ideal for your yarn measurement Sturdy and Smooth -- The spinning control card is made of quality 0.1inch(3mm) thick wood material not easy to break or bend with long time usage polished to smooth hardly let your yarn snag or up while safe to your hand comfortable to hold Dreamful Pattern -- The yarn WPI guide gauge is designed in matte finish wood texture carved with moon phase mushroom patterns dreamful beautiful and exquisite decorative while practical adding more visual enjoyment and fun at your knitting process Convenient Gauge Gift -- The sewing tool is designed with a lobster clasp easy to attach on your stitch work or spinners etc also can be hang to save space the convenient sewing tool is a great gift to tailor sewing projects lovers daughter mom grandma etc