Trademark Octagonal Wood Billiards Quartz Wall Clock Clever octagonal clock design. 11.75 inches in diameter. Solid oak with dark green Mali felt. Smaller scaled, real pool balls for numbers. Requires 1 AA battery, not included. This clock measures 11.75 in diameter. This clock has a quartz movement to ensure accurate timekeeping requires 1 AA battery (not included). Smaller scaled, real pool balls for numbers. Requires 1 AA battery, not included.