How-To Use Our Arteza Water Brush Pen Set: Our painting brush set works well with dry watercolor cakes. Simply fill the reservoir with water and start painting! With a gentle squeeze and a little mixing with the brush, you can activate the paint to your desired consistency.You Can Paint with Ink & Acrylics: Because our refillable brush pen set is designed with durable nylon bristles, you can use it with ink or acrylic paints. Just dip the brush in water-based ink and use the water in the pen’s reservoir to lighten the ink or, alternatively, fill the pens with ink.Soft Nylon Bristles & An Assortment of Tip Sizes: This painting pen set includes 3 fine tip and 3 broad tip pens: 1 small fine tip pen, 1 medium fine tip pen, 1 large fine tip pen, 1 small broad tip pen, 1 medium broad tip pen, and 1 large broad tip pen.Designed and Created by Artists: Here at Arteza, we are passionate about creating products that inspire. For us, art is an expression of the human experience. That’s why we work to make our art supplies accessible to all people.We Care About Our Customers: We want to ensure you have a great experience with our products because we truly care about our customers. Our team strives to create products we’re proud of. If you have any issues with our products, please reach out and we’ll make it right.