Size 7 Inside diameter: 0.68inch / 17.32mm Inside circumference: 2.14inch / 54.4mm
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Size 8 Inside diameter: 0.71inch /18.14mm Inside circumference: 2.24inch / 57mm
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Size 9 Inside diameter: 0.74inch /18.95mm Inside circumference: 2.34inch / 59.5mm
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Size 10 Inside diameter: 0.77inch / 19.76mm Inside circumference: 2.44inch / 62.1mm
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