Comes in Packs of 5
Each wood dowel rotor is made of a 10cm long wood dowel with outer diameter of about 2centimeters. Both ends are turned to reduce the outer diameter to 7mm (3/8"). A 1/2" hole is made in the middle part to house a bar magnet or cow magnet.

Styrofoam balls for making DNA models and models of molecular structures of chemicals. Can be painted using latex paints or other water based paints.