Fiskars 3-inch x 18-inch acrylic ruler. a must have ruler for every sewer or quilter. it"s the right size for cutting the full width of fabric right from the bolt. made from clear acrylic and 3mm thick, this ruler is durable and has easy to read measurements in the fiskars "coastal pink-inch colors. the 30, 45 and 60-degree bias lines are clearly marked.