They are made of steel

They are especially suitable for Sashiko

They work equally well for reinforcing or decorating garments that are exposed to wear and tear

In this book by Sashikonami

Rit All Purpose Liquid Dye - Eggplant remake They are made of steelA timeless classic that has been dyeing textiles new and old for over a century. Rit All Purpose Liquid Dye brings natural materials like cotton, wool and silk to life, as well as synthetic fabrics like nylon and rayon. A simple and non toxic solution for adding color to clothes, home decor and much more! Quantity: 236 ml Contents: Salt (Sodium Chloride), Anionic and Nonionic Surfactants. There are instructions on Rit's website: Ritdye. com