Based on this product's specifications, here are some alternatives and similar models
Cutter Brother PACU004 for Label Printers Compatibility: TJ-4020TN TJ-4120TN TJ-4021TN TJ-4121TN
Summary description:
The Brother PACU004 Cutter is designed for label printers, ensuring precise cutting for models TJ-4020TN, TJ-4120TN, TJ-4021TN, and TJ-4121TN. It enhances efficiency and accuracy in label production, making it an essential tool for businesses that rely on high-quality labels.