1.Apt Sizes for Various Needs: Our blending pens come in two sizes to cater to different art requirements. The larger pen features a nib diameter of approximately 0.47 inch/1.2cm with a total length of 5.9 inch/15cm, while the smaller one comes with a nib diameter measuring approximately 0.24 inch/0.6cm and a total length of 5.51 inch/14cm. 2.Package Inclusion: This set comprises 4 blending sponge pens available in 2 key sizes, apt for multiple drawing needs. The bundle enables a sufficient supply for your projects and art classes. 3. Quality Material: The blending pens are carefully designed with quality sponge, felt, and plastic pole. The blending sponge pens come with a black tip made of sponge and a white tip made of felt, aiding in seamless blending. The robust plastic pole enhances grip and is washable and reusable. 4.Innovative DualTip Design: Each blending pen comes with a dualtip design to offer enhanced flexibility. The black tip of the larger pen is for shadowside transitions while the white tip is for transitioning halftones into light and dark sides and blending light sides. The black tip of the smaller pen serves to handle details, enhancing the visual appeal of your sketches.