Make your heart with any size yarn and appropriate needles. For the small heart, 5.5cm high, I used sock yarn with 3.25mm (US 3) needles; for the middle size (8 cm high) I used Lion Brand 24/7 cotton with 4mm (US 6) needles, and for the large size (10cm high) I used sock yarn held treble using the Navajo method (no need to cut the yarn!) A video link is included showing how to use this amazingly easy technique.