The Smith Corona C17657 Typewriter Cartridge Ribbon in black nylon is designed specifically for use with Smith Corona typewriters. This sealed ribbon cartridge is compatible with the Smith Corona brand and is ideal for re-inking your typewriter for optimal performance. With dimensions of 9.5 inches in length, 5.5 inches in width, and 2.5 inches in height, this ribbon cartridge is a reliable and efficient solution for all your typewriter ink needs.