The plastic parts are made of medical-grade PP and the pigment is imported masterbatch, providing pure, bright, vibrant, and durable colors that do not migrate or fade. They are free from heavy metals and are non-toxic. The ink is food-grade, non-toxic, odorless, and provides pure, bright, vibrant, soft, and strong coverage colors. It is safe, reliable, environmentally friendly, and easy to write with. The erasable watercolor pens come in 12 colors, allowing you to write and erase as you go, making them very convenient. Each pen cap is equipped with an eraser. The product is sold in a package of 144 sets, each set containing 12 colors. Welcome to purchase.