(a) Round: Simple 20mm round hole, as No.2 on the chart.
(b) Age Bar: Simple vertical bar as No.199 on chart.
(c) Simple: These include the following numbers on the above chart - 37, 38, 39, 40, 44, 48, 49, 53, 54, 57, 58, 59, 60, 64, 65, 66, 67, 147, 149 (Cat A list).
(d) Complex Single: These include all the numbers not listed as Simple in the entry above.
(e) Complex Double: These are double complex marks on the same marker plier.
NB: These ear markers are lighter quality than the registered-brand ear markers we also list.