Small Ear Tag 
can fit a maximum of
Design, 2 rows and 6 characters (numbers and letter) or across 8 characters (with dots)
Medium
Can fit a maximum of
Design (1st row)
6 characters made up of numbers and letters (2nd & 3rd row) 
Large Ear Tag
Design (1st Row)
12 characters across made up of numbers and letters (2nd, 3rd and 4th row)
Customers don't have to meet the maximum charators, but please do not exceed them as it will not fit. Please be aware the scale/size of the numbers and letters only come in 4mm or 6mm. Please view images are reference