Plastic-
"Four different shapes interchangeable handle... Multiple possibilities! Make 4 Shapes: Oval, Round, Square & Triangle in 23 sizes with just one tool! Now the possibilities are endless! Craft beautiful wire objects, such as home accent pieces, lovely jewelry & ornaments, or just about anything you can imagine! Includes one interchangeable handle with four plastic mandrels (round, oval, square & triangular) to create uniquely shaped jump rings, toggles, pendants & more!"
(Bead Smith 2017)