Pinch two dice from an old unwanted board game or buy some from a toy shop.
Drill through one of the number dimples on one dice so that it comes out of a number dimple on the opposite side.
Make sure you made a nice clean hole and then repeat with the other dice.
Cut a length of elastic about 22 cm long.
Slip one of the beads on to the elastic and slip in to the middle. Knot together the two ends of elastic half way down each end.
Slip on the second dice. Tie a secure knot at the end of the elastic and then slip the knot inside the hole of the second dice.