1.Features: PRACTICAL DOUBLEENDED DESIGN: This blending sponge pen features a practical doubleended design, with the larger pen's black tip for shadow side transitions, for initial blending, and the smaller pen's black tip for working on details. The larger pen's white tip is for transitioning halftones to light and shadow edges or blending glossy surfaces, making your sketches more dynamic and visually appealing, and you can use the smaller pen for side details. 2.Sufficient Quantity: Pack includes 6 mixed tree stumps, available in 2 sizes; sufficient quantity for group activities in art classes, or as a useful addition to an art kit, ensuring you always have your pen handy while creating. 3.RELIABLE AND COMFORTABLE MATERIAL: The sketch wiper pen is made of quality sponge, felt and ABS. The black tip is made of sponge and the white tip is made of felt, which helps blend different sides smoothly. The sturdy ABS shell ensures durability and a comfortable grip, long lasting and provides a pleasant experience.