In a general sense, transmission lines are electrical transmission lines connecting power supply of kilos of volts from the thermal generating station to distributors and consumers. However, there also exist transmission lines, which carry electricity of lower voltage and higher frequencies.
The images of product "XT90 Parallel 2M-1F XT90 (10cm)" shows 10AWG cables, but what is sent is 14 AWG. Anyone with basic electrical background will know that XT90 plug is meant for high current of ~90 Amps, so it doesnt make any sense to have a product with 14 AWG cables. It is a poor quality product with misleading product images.