World Famous Krink ink in a 4 ounce mop. 4oz Permanent Ink Mop. A Krink Original, The Krink 4oz mop is filled with super black, opaque ink. Extra Large Round nib & a massive 4oz capacity maje this marker ideal for working in large areas. Writes on most surfaces: excellent for use on metal, wood, canvas, painted surfaces, & paper. Highest quality, Handmade in the USA. Krink 4oz Mop bottles are recyclable (2 resin code) HDPE plastic.