The Multisizer works like a belt, simply push the end through the buckle to form a ring shape. Slip the ring sizer onto your finger and adjust to give a comfortable fit, checking that it just slips back over the knuckle. Size ‘O’ shown on packaging. The perfect way to measure your ring size before ordering your ring. This is the UK Model. Ring Size A to Z. Manufactured and distributed from the UK. Colours and styles of product and packaging may vary from pictures. Warning – Choking Hazard (Small Parts). Please keep product and packaging away from Babies and Children. For 18 years and above. This is not a toy.