This is high quality, high strand count black silicone wire. It’s super flexible, has a silicone insulating jacket designed to withstand 392°F (200°C) and contains low resistance copper wire that is tin plated for anti-corrosion.
16 AWG wire is fairly thick wire, with the conductor cross section equal to 1.31mm². It is rated for up to 30 amps of continuous current under optimal conditions (exposed to air flow, etc). It can be useful for discharge wires for medium power battery projects or charge wires for nearly any power level battery setup.
The wire is sold by the foot. If you select a quantity of 1, you’ll get 1 foot (12″). If you select a higher quantity, you will get a single piece of wire with a length of however many feet you selected.