The flat speaker cable with its very fine, braided (not stranded) wires is extremely compact and lexible. It can be perfectly laid under carpets or behind skirting boards. Ideally suited for surround systems.
Finely-stranded: 0.10 mm (1.5 mm²) / 0.07 mm (2.5 mm²)
“Invisible” to lay under carpets or behind skirting boards