Based on this product's specifications, here are some alternatives and similar models
Thermal Binding Covers GBC LeatherGrain 1.5mm Black 100
Summary description:
GBC LeatherGrain Thermal Binding Covers are designed for A4 documents. Made of durable PVC, these black covers provide a professional finish. Each cover is 1.5mm thick and comes in a pack of 100, making them ideal for bulk binding. The transparent front allows for easy visibility of the title page, while the sturdy material ensures long-lasting use.