PRODUCT PHOTOSRING SIZE MEASUREMENTUnited StatesRussia sizeUnited KingdomBrazil sizeFrance sizeJapan sizePerimeter (inside)515.70.5J1249949616.50.5L14521252717.3O17541455818.1Q19571657918.9S215918591019.80.5T246220621120.60.5V266423651221.40.5X286725681322.3 316927701423.1 33722972.5Use smaller rope will better Measure rope must be tighten(very important) Measure 2-3 times ,measured in millimeters -SHIPPING- Item will be shipped within 24 -48 hours after full payment is received. The Item will be shipped by air mail，Normally the shippment to worldwide is used to take 20 to 40 business days, exclude Sat & Sun. -PAYMENT- We accept PayPal only. Payment must be received in 7 business days of product closing. . -WARRANTY- If the item is defect when you receive it or you are not satisfied with it, please return it within 14 days for a replacement or money back. But the items must be back in factory condition. Please contact us and double check the return address before you return it. If is item is defective in 3 months, you can return it to us. We will send you a new replacement after receiving the defective item. -CONTACT US- If you have any questions, please feel free to email our service specialists 24 Hours a Day, 7 Days a Week, and we will reply you ASAP. If no response within 24 Hours, please check the spam of mail box or kindly re-send it to us. We greatly appreciate your POSITIVE feedback. Please do NOT leave negative or neutral feedback without any contact. If you haven't received item