K12x15x13
Allura mai amfani da kaya don amfani da rollers cylindrical tare da tsawon lokaci-zuwa-diamita 4: 1. Wannan "allura-kamar" Geometry yana ba da damar kwarin gwiwa mai ƙarfi a cikin matsanancin sassan, samar da mafi yawan sararin samaniya idan idan aka daidaita da ball.