This is a 1 meter length of 10 AWG black high flexibility silicone wire from ProTek R/C.
ProTek R/C is an AMain Sports & Hobbies brand.
Tuesday, Feb 13 2018 (about 3 years ago)
ProTek RC 10awg Black Silicone Hookup Wire (1 Meter)
Nice high quality wire! Very flexible and easy to work with. I used this wire to run my batteries in series on my 700 class helicopter.