The Porelon 11201 PR12 Calculator Ink Roll is a set of 4 purple ink rolls designed for use with Canon, Texas Instruments, and Sharp calculators. These ink rolls have dimensions of 2.25 x 4.5 x 6.75 inches and weigh 0.48 ounces each. Made by Porelon, a reputable brand in the industry, these ink rolls are reliable and high-quality for all your printing needs. Ideal for businesses or individuals looking to refill their calculator ink, these rolls are a convenient and efficient solution for precise and accurate calculations.other compatible brands are listed on the back of the package. see photos