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 Z18 means its 18" (inches inside length) 475Li is the inside length in metric. 497Ld is the datum length which is the length if you measure the middle of the belt all the way around.