Here’s a homestyle Block on Board (BOB) die that’s sure to “preserve” your quilting energy! Making fun 8” blocks has never been quicker, and the ways to use this adorable block are endless. Canning Jar Pieced is a Block on Board® (BOB®) die which means it’s specially designed to cut one 3-color, 8" finished block in one pass through the cutter. Canning Jar Pieced features specialized dog-ears and ¼" seam allowances for easy alignment and piecing. You will need a 10" x 10" GO! Cutting Mat.