The SASO β/τ F-26 driver is a golf club designed by Dr. Sasaki (Dr. Sato). This club is characterized by the formulas written on the sole, and it is claimed to have been designed with a scientific approach. - Model: SASO F-26 - Features: Unique design and a head engraved with formulas - Face: Steel, with guidelines on the hitting surface - Color: Black, glossy finish There are scratches from daily use. Please refrain from purchasing if you are concerned. Please refer to the photos for the condition. Flex S / 10.5° Thank you for viewing.