These sinks are cast out of GFRC high performance concrete and are only an example of what we can make. These sinks are ultra high quality made from a custom blended proprietary mix. Our mixes achieve close to 6,000 psi in 24 hours and 14-18,000 psi strength in 28 days. The industry norm is 6,000 to 10,000 psi strength in 28 days as a comparison. Price is based on size and location along with other factors. Contact me for more details and thanks for looking.