This colorful needle gauge is perfect for travel knitting. The discs swivel out and click back together with tiny magnets (which makes it as much fun to play with as use) and the whole rainbow tool is small enough to pop into your project bag so you'll never leave home without it. See product details below. 

• Discs are for identifying knitting needle sizes US 0-15 / 2-10 mm
• Overall size (closed) is approximately 1" diameter X 1.5" high (2.5 cm X 4 cm)
• Gauge clicks into place with tiny magnets embedded on the underside of each disc
• The discs are made from 100% fiber waste called polylactic acid, which is made from fermented plant starch such as corn, beets or sugar cane.  It is 100% biodegradable and contains no plastic
• The discs are arranged in ROYGBV - the beginning disc color is random