BCY 62XS Braided CenterServing Black .021 75 yds. 29469. This string center from the fine people at BCY features the same specifications as regular 62 serving but it 20percent stronger and more durable. The BCY 62XS Braided Dyneema Center Serving is made with the same material as synapseless 62 serving but it is 20 percent stronger and more durable. This string center from the BCY Brand meets BCY string specifications (for sizing information see 62XS - sizing chart on product page) as well as the regulations (see below for details). Don't let your bow go without the BCY 62XS Braided Serving. Package Contents: BCY 62XS Braided CenterServing BCY 29469: 62XS Braided CenterServing Black .021 75 yds.