The Nittaku Fastarc G-1 rubber is "Fast" with an "Arc"! A power topsheet with a built-in tension power sponge produces the ideal combination of ball speed and ball arc -- an outstanding powerful spin ball. G-1 means "Grip First". Choose Fastarc G-1 for more spin with great power. This rubber is used by Kasumi Ishigawa, Mima Ito and Masataka Morizono.