The two wedges are pierced with holes large enough for the tip of a Tala Cake Tester to go through. One wedge is equal to 1/16 of a circle. Two wedges, hinged together, form 1/8, 1/10 and 1/12 of a circle. This product is based on the original Tala Cake Marker design in the 1960's Tala catalogues.