Don't Know your Ring Size?No problem! This listing is for one plastic UK ring sizer, with UK sizes A-10, which is easy and simple to use! To use, form a ring with the sizer around your desired finger/thumb and tighten the band to a comfortable fit. To get an accurate ring measurement, please ensure that the 'ring' fits over your knuckle, and on and off your finger easily (as you would want your ring to fit). It is reusable so all your fingers can be measured if need be. The readings will be on the UK A-Z system. Comes in a branded sealed envelope which also displays instructions of use. Thanks for you time!!