Water Soluble Dry Sketch Materials Charcoal Strips. Specifications: Quantity: 4 Charcoal Pens / Box Size: 9.7x1.2cm Box Size: 12.8x9.7x2.2cm Instructions: 1. When Drawing a Thin Part, Please Use a Knife to Scratch the Tip of the Pen. 2. Store the Scraped Powder in a Bottle for Wet Painting. 3. When Using the Wet Painting Method, Dissolve the Powder in Water and Use It for Sketching. 4. No Matter What Method of Painting, After the Painting is Dry, You Can Use an Eraser Dry Painting Method: Using Charcoal Directly Wet Painting Method: Scrape the Charcoal into Powder, Put It in Water, Use a Brush to Paint or Directly Dip the Charcoal in Water. We are an international based seller that will ship your order from abroad, please at least a minimum 14 working days for delivery right now due to the ongoing delays in shipments globally.