Check the listing for details. O'lipfa Mini Ruler 4 X 4. Condition: Used. Listed at 7.99 USD. The O'lipfa Mini Ruler 4 X 4 is a compact and precise measuring tool designed specifically for sewing projects. With a 4 x 4 inch size, this ruler is perfect for accurately measuring and cutting fabric for various sewing projects. Its small size makes it easy to handle and store, while its durable construction ensures long-lasting use. This ruler is a must-have for any sewing enthusiast looking to achieve precise and professional results in their crafting projects.