[Measurement size]: Measures Fingers from Size 1-17 (USA Sizes) reading is clear, easy to use, and can be used for other jewelry measurements [Usage and method of use]: US size, just wear it in your hand, and then adjust it to a suitable position for measurement. The inner diameter of the ring is measured and can be removed at any time like a ring. [Scope of use]: Ideal for weddings, birthdays, party gifts, and jewelry [Included packaging]: 1 x American size measuring finger [High quality]: Smooth surface, will not hurt your hands, fine workmanship, reusable, not easy to deform. p Is the ring sizer accurate? - They are very accurate to measure and can let you know the size of your finger clearly and is universal for men, women, and kids. - How is the material? - Medium hardness, smooth surface, will not hurt your hands, and bring you good measurements - experience. - Is it easy to use? - Just wear it in your hand, and then adjust it to a suitable position for measurement. The process is very simple.