Each stitch was carefully and meticulously done with embroidery thread. It's very light, but to avoid putting stress on what you attach it to, we recommend adding a layer of fabric to the back. Decorate your clothes, bags, scarves, etc., and go out with a smile! ♫ How about using them as markers for your children's belongings? ＜Yarn Bird Size＞ Length: Approximately 4.0cm, Width: Approximately 5.8cm ＜Light-colored Square Size＞ Length: Approximately 5.0cm, Width: Approximately 5.3cm