A. The AB Long Ruler is especially designed to help you draft long lines, parallel lines, and bias lines on a pattern block. It is especially useful for seam allowances and facing lines. But it can also have many other applications.
B. The AB Curve Master is especially designed to help you draft those long curves on a pattern block that are so difficult to get right! It is especially useful for the curves on trousers and two-piece sleeves. But it can also have many other applications.
C. The AB Flexi-Ruler is designed to help you measure curves, necklines, armholes etc. You can mark parallel increments and measure simultaneously down and horizontally on corners. It has cm on three sides and inches on its right side.