9.5" x 11" 3-ply computer paper is a continuous form paper designed for use with dot-matrix and impact printers. It's composed of three layers (plies) of paper, typically used for creating multi-part forms such as invoices, receipts, purchase orders, delivery orders, and other official documents where duplicates are required. The paper is "continuous" as it's folded into a fan-fold format with perforations at regular intervals, allowing for uninterrupted printing of large batches. It features pin-feed holes along both sides, which engage with a tractor-feed mechanism in the printer to ensure precise paper feeding and alignment. Many 3-ply forms are "NCR" (No Carbon Required) paper, meaning they use a chemical coating to transfer images from the top ply to the subsequent plies without the need for messy carbon paper.

Key Features:

• Multi-part forms: Allows for original and multiple copies to be created simultaneously.
• Continuous feed: Designed for high-volume, uninterrupted printing with dot-matrix printers.
• Pin-feed holes: Ensures accurate alignment and smooth feeding through the printer.
• Perforated: Easily detachable sheets after printing.
• NCR (No Carbon Required): Most commonly, it's carbonless, offering clean and clear copies.
• Color-coded plies: Often, the plies are colored (e.g., white, pink, yellow) for easy differentiation of copies.