Building Blocks & Borders is a HUGE compendium of 40 paper pieced border blocks in 4 sizes each. Each block is a unit that provides the basis for a variety of quilting borders. Each of the 40 blocks is offered in four sizes: 3", 4", 5" and 6". These standard sizes make for the possibility of hundreds of unique borders and you can mix and match them with any of the others included here. Many of the patterns also offer corner units and mirror image (reverse) units. This is a perfect way to create your own unique Row by Row quilt, too! This 114 page pdf is a treasure trove of delights for any serious paper piecer. This will work with any modern computer and does not require you to be connected to the internet to access the files. It is assumed the user understands the basics about foundation paper piecing. I offered this set of blocks for 15 years on a CD and my price has not changed in all that time! What are you waiting for?