This 21.0mm black on white heat shrink tube cartridge offers durable, clear labeling compatible with Brother PT-E300VP, E550WVP, D800W, P750W, P900W, and P950NW models. Its 3:1 shrink ratio ensures a secure, professional finish ideal for protecting wires and cables from abrasion and environmental factors. Upgrade your labeling tasks with reliable, easy-to-use heat shrink tubing designed for lasting identification and enhanced organization.