These are a mohair/poly blend cinch handmade right here near Tamworth NSW and are available in a number of sizes.
These use either stainless steel or brass buckles and dees and are a standard 17 strand cinch which measures approximately 5 inches across.
We use these cinches extensively including on sensitive skinned horses and they stand up to many years of hard regular use.
Please note these will usually take around 2 weeks to be completed and maybe longer at peak times.