The Long Head Deep Hole Marker Pens are a set of 15 cylindrical markers with a solid pattern and bold point type. These quick-drying, waterproof markers are suitable for marking and writing on various surfaces such as wood, glass, plastic, and metal. The markers come in a range of colors including black, white, red, green, and blue, and are made of durable polypropylene material. With a 20mm long nib, these permanent markers are ideal for adults and offer a 1.5mm line size for precise and clear marking. Made in China, these markers are a reliable tool for art projects and crafts.