Check the listing for details. Excalibur Crossbow Matrix String Designed for use on all Matrix Crossbows #01992. Condition: New. Listed at 34.99 USD. Ships From FarmsteadArcheryBrand New! Excalibur CrossbowMatrix String Designed for use on all Matrix Crossbows #01992 Matrix String Excalibur Introduces a high-performance crossbow string and center serving on its Matrix series crossbows. Constructed of BCY Dynaflight 97 material Excalibur’s Matrix Crossbow String produces two distinct advantages. First, it increases speed, which is a key attribute of Matrix Series crossbows. The Matrix 380 Xtra, for example, shoots 380 fps! The second advantage is reduced creep which allows you more time shooting, less time tuning. The Excalibur Matrix string also features a new proprietary center serving which will give you increased string life. For Matrix Series crossbows only.