Large pieces are terrific for demonstrating math concepts on a white board. Set includes a magnetic 30/60/90 triangle, magnetic 45/45/90 triangle with built in 180 degree protractor, magnetic 39-1/2" ruler and a compass with universal adaptor. Triangles are 19-1/2" long with centimeter markers on one edge. Ruler features inch and centimeter markings. Compass legs measure 16-1/2" long. Includes removable handles, so manipulating the pieces on the board is a snap. Comes in a reusable plastic storage case for easy transportation.