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This 8g 1.3cm no flare glass straight retainer comes with two o-rings. The length measurement is end-to-end. The wearable area is about 0.6cm shorter than the overall length. This gives the o-rings enough room to stay on. For example, the 1.1cm straight retainer has a wearable area of about 0.5cm . Math refresher: 0.6cm = 0.6cm . 1.1cm - 0.6cm = 0.5cm .