The Leaf Ruler can be used as a trimming tool for the Sea Leaf units used in various designs by Quiltworx.com, including the Coral Reef pattern. One ruler is included in each Coral Reef Pattern, so if you have one of those, you will not need a stand alone ruler. This ruler is for those who have not ordered the Coral Reef pattern in the past. Quiltworx has many designs that have curves and a couple other curve ruler options. This ruler is different that Judy's other rulers as the curved edges are more pronounced, making it a great option for cutting deeper curves in your quilts. We like this ruler specifically for patterns like Cabin Fever, Country Picnic, The Beach House, Osprey's Nest Log Cabin, and the Lincoln Log Cabin Table Topper. It is also a great ruler for quilts that use the Fireworks block series, like Riptides, Autumn Wildwoods, Sunflower Illusions, and others.