Each disc is imprinted in both US and mm needle sizes from US 0-15 / 2-10 mm
Overall size (closed) is approximately 1" diameter X 1.5" high (2.5 cm X 4 cm)
Disc are in an array of rainbow colors created to bring joy to your day and a smile to your face!
Gauge clicks into place with tiny magnets embedded on the underside of each disc