The
pieces shown below were made from old Mastermind pegs.
The Triples, ball and Quarterback are the side pegs turned upside down.
The Doubles and Single have been made by cutting off the top of the
main pegs. Mastermind spares are sold on Ebay.
Note that because the attacker cannot play a Single but must play a
Quarterback, and the defender cannot play a Quarterback but must play
a Single, it's necessary to have only one Quarterback and one Single
in a set of pieces. These are usually coloured black and white as shown.
The yellow peg shown in the photo is the ball.