Drilled/Assorted Balls Set, Can be used for all pendulum experiments., Each

Details

This economical set includes 12 drilled balls for all your pendulum experiments. The set contains two 25mm-diameter balls each of brass, aluminum, steel, wood, cork, and copper, stored in a plastic box for easy storage. All the drilled balls feature 3mm countersunk holes, allowing pendulum cord knots to be recessed.