How long is this StarTech bulk Ethernet cable and what color is it?

The cable is 1000 ft. long and comes in gray.

What type of network performance is this Cat6A bulk cable optimized for?

This Cat6A bulk cable is optimized for 10 gigabit networks and is suitable for 10GBase-T Ethernet connections.

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Startech Bulk Cat6A Ethernet Cable - 1000ft - CMR Riser Rated - S/FTP, Pure Bare Copper - 23AWG Solid Wire - Gray - TAA Compliant - WIRC6ASPATGR1K

This bulk Cat6a cable meets or exceeds all Category 6a cable specifications to ensure reliable 10Gb network connections. The cable is shielded to protect your network against electromagnetic interference (EMI/RFI) and system noise, providing the perfect solution for fast and safe network connections.
Each cable is tested for up to 500MHz frequency and is more than suitable for 10GBase-T Ethernet networks.
Constructed with 100% copper and foil-shielded, twisted-pair wiring, this cable was built for quality performance. The cable is designed to keep the data signals traveling through your network free from interference and is perfect in environments that are prone to large amounts of EMI.
The 50-micron gold connectors deliver optimum conductivity and eliminate signal loss due to oxidation or corrosion.
Each of our cables is manufactured using high-quality copper conductors and they are carefully constructed and tested, to keep Near-End Crosstalk (NEXT) well within acceptable limits.