These liquid chalk pens are made of premium material, environmental protection, odorless, safe, and for use. They write smoothly and are comfortable to use on most surfaces, such as paper and whiteboard. Features include a white color, ABS material, and a size of 12.40X1.30X1.30cm/4.87X0.51X0.51in. They are suitable for most surfaces, including glass, paper, plastic, and blackboard, making them a great choice as a gift for friends.