This set includes a 1.25oz. bottle of Masking Fluid, the Masking Fluid needle applicator tip and the SuperNib needle applicator tip. Both work like resist pens, and are perfect for crafters and watercolor painters who use masking fluid often. Use them to make precise, controlled lines, dots, or area coverage with ease. No need for a brush. Apply masking fluid over the area to be protected, and let dry. Once dry, paint over the protected area and let dry again. Peel off the dried mask or resist to reveal the uncolored area. The Masking Fluid Pen dispensing tip is 20-gauge and 1/2" long, and the SuperNib dispensing tip is 18-gauge and 1" long. Both have a unique cap/wire system to ensure a continuous flow of liquid from start to finish, always precise and controlled. When closed, the cap maintains an airtight seal so that the masking fluid never dries out and is always ready to use. Details:3 pieces1.25 oz.bottle of masking fluidStainless steel20-gauge needle applicator tipStainless steel 18-gauge needle applicator tipReusableHypo-allergenic