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Description: Material: Stainless steel Size: inner diameter of about 22mm Color: black, gold, silver The No.8 is 57mm,suitable for people with 55-65 kg The No.9 is 61mm,suitable for people with 65-72.5 kg Package Included: 1*Stainless steel ring opener This truly wonderful innovation fits your finger and lets you pop up like a magic. Simply place your hand on top of the bottle to measure the protection under the ring. Design the ring for ease of use. It is used to open beer bottles for easy transportation. Notes: 1.Due to manual measurement, please allow an error of 1-2 cm, please make sure you don't mind before ordering. 2.Due to the difference of different monitors, the picture may not reflect the actual color of the product. 3.Due to lighting effects and computer color, the actual color may be slightly different from the picture.