3 needles on the card.
What a great invention! By threading both eyes the stitching is smooth. Different color threads, yarns and ribbons can be coordinated. Think of the possibilities. There are three different sizes:
#15, 1.81mm in diameter, 60mm long
#17, 1.35mm in diameter, 54.6mm long
#20, 1.07mm in diameter, 45.5mm long.