My husband bought this after being recommended it at a golf course shop, wore it for 1.5 days of play, and said, "I might have gotten worse..." so it was quickly retired after only a day and a half... It's not because of the Coreforce, so please use it with confidence ♥ Subtly and elegantly crafted, a jet-black shine A mysterious and deep adult black color ♥ Coreforce Black Spinel CFL70 Materials Black Spinel (decorative parts) Ferrite magnet Samarium-cobalt magnet SUS316 (cap part) SUS304 (wire part) No accessories Size: 70cm Retail price: ¥58,300 Authentic Coreforce engraving present! (See images 5-6)