This is masking fluid (pen type) made by Holbein. It's a standard item that's convenient for protecting highlights and differentiating areas when creating watercolors and illustrations. 【Product Details】 ・Manufacturer: Holbein ・Product Name: Masking Fluid Pen Type ・Model Number: W469 ・Capacity: 25ml ・Uses: Watercolor / Illustration / Art Creation ・Made in Japan 【Features】 ・Pen type makes it easy to use for fine lines and partial application. ・By peeling it off after drying, you can cleanly preserve the whiteness of the paper. ・Can be widely used by watercolor beginners to advanced users. 【Condition】 ・Used, but almost unused. ・Please refrain from purchasing if you are concerned about home storage. Please feel free to comment if you have any questions.