The front of the ruler is engraved with information on the evolution of horses from their small forest dwelling ancestor.

On the back of the ruler there is a 50 million year timeline with some of the horse ancestors depicted.

The rules has inch and centimeter scales.
It is 30 cm (12 inches) long and 3 cm (1.2 inches) wide.
The ruler is made from 3mm high quality Baltic Birch.

This is an unique gift. Ideal for teachers or students and, of course, horse lovers.