The Lot of 2 Grout Pens by Rainbow is a must-have for any DIY enthusiast or professional tiler. These pens feature a rapid setting formula that allows for quick and efficient grouting. Additionally, the mold-resistant feature ensures a long-lasting and durable finish. Perfect for filling in gaps and seams in tiles, these grout pens are a convenient and effective way to enhance the look of your flooring and tiles.