Instructions: The Multi-sizer works like a belt. Simply push the end through the buckle to form a ring shape. Slip the Multi-sizer onto your finger. Adjust to give a comfortable fit, checking that it just slips back over the knuckle. When best fit is achieved, read off size indicated by the arrow. Adjust until you get the correct fit and in a matter of minutes you can size every finger you have. It is 5mm wide so keep this in mind if you will be ordering thinner or thicker bands. Thinner bands may feel more loose and thicker bands cover more of your finger and fit tighter the thicker/wider they are. The sizes are written across the white band on the fingers. It is complete with spaces for your regular rings & midi ring sizes.