Berkley FireLine Crystal Fishing Line 300 - yd., CRYSTAL, 4 LB Thermally fused FireLine Crystal combines the ultimate in low-underwater visibility with all of the FireLine benefits The first translucent superline, ultra lo-vis Thermally fused FireLine Crystal is smoother than ever - right out of the package The smooth handling superline - optimized for spinning reels We are re-launching the Next Generation of FireLine Crystal