Easy to read and always precise, Frosted Advantage acrylic rulers give you the precision you need in a craft ruler. The OLFA QR-16S 16 1/2" Square Frosted Acrylic Ruler is just the right size for a quilting ruler and features clearly visible numbers and a non-slip backing for optimal control. Designed for accuracy and precision with grid lines marked in 1/8?, 1/4?, 1/2? and 1? increments.