I think it was part of the School Books’ List for Form One students (can’t remember so clearly now). They came in a metallic box, with a pair of compass, a pair of dividers, a pair of set squares, a protractor and a 6-inch rule.
With those instruments, we were set on our course of learning a particular discipline of mathematics, called Geometry. We drew circles, parallel lines, orthogonal lines and, measured angles, etc. I think the least used was the divider.
Undoubtedly, the brand that was almost universally used was “Oxford”. I think there was another brand called “Cambridge”, but am not so sure.