All of these rulers and templates are laser cut from side lit neon acrylic. The laser etchings of the florescent material mean the lines glow when placed over fabric. These etchings are marked at 1/4" or 1/8" intervals and will not wear off over time.
Even Ups are square templates used for fussy cutting or for making pieced blocks square. Position the template over the pieced block using using the lines as a guide. Then all four sides are ready to cut, no need to reposition template!