BCY 452Xtra bow string material is the material that all others are compared to. Since it's introduction it has proven to have superior stability compared to other bowstring materials on the market. It is comprised of 67% SK75 Dyneema and 33% Vectran and has half the diameter compared to 450 plus. BCY 452Xtra now had a High abrasion resistant Vectran. BCY 452Xtra bow string material is available in over 50 colors including several in the speckled variety with a break strength of 75lbs. Normal strand count is 20-24 strands for compound bows. 452Xtra is available in 1/8lb, 1/4lb and 1lb spools. The 1lb spools are available by pre-order only. We place weekly BCY orders each Monday and usually have them within a week or 2, depend on BCY's current lead time.