"Math Dial" Watch Shows Math Equations At Each Hour Indicator on the White Dial of the Large Polished Chrome Watch with Smooth Brown Leather Strap The "Math Dial" theme watch has a unisex size 42mm round brushed chrome case. The watch comes with a smooth brown leather strap. Designed with a white dial that shows a math equation at each hour indicator. Perfect gift for a math or physics student, math enthusiast or numerologist.