Specifications:

Pure soft and flexible silicone wire. This wire is the best quality you can buy. Silicone wire will remain flexible like a rope and not easily become bent. However, you can work the wire and put a sharp kink in it by bending a tight corner to make it fit a set path. We sell silicon wire by the meter and if you order for example 3 meters we will if possible supply you with 3 continuous meters of wire.

I like to use the following sizes of silicone wire.
30 AWG – for wiring up most peripherals like receivers, GPS and UARTs for VTX etc. I use 30 AWG wire for 5 volt supply to   VTX units up to about 400mw. Over 400mw use 28 AWG for Pos and Neg.
28 AWG – Also suitable for Vbatt on VTX units above 400mw and even Vista units pulling up to 1.5 amps. 
For the main battery lead to the flight controller, I use 22 AWG for whoops with GNB27 and BetaFPV BT2.0 connectors. 20 AWG is best for 2 to 3 inch drones running on 2 to 3S with an XT 30 connector. For anything around 3.5 inch on 4S I use 16AWG with XT30 connector and for 5 Inch on 6S I use either 12 or 14AWG, but 14AWG is usually adequate.