Optibelt VB S=C Plus Z section Z/10, 10mm = width across the top of the V

Z/10 Section, Please note. Some of the smaller sizes will come with teeth on, flexibility for going around smaller pulleys.

The item description is what should be marked on an Optibelt belt. To explain its give the metric and imperial size.

So the Z16 means its 16" (inches inside length) 425Li is the inside length in metric. 447Ld is the datum length which is the length if you measure the middle of the belt all the way around.