T-Shirt Alignment Ruler: The T-Shirt Alignment Ruler is made of sturdy PVC. No need to worry about pvc ruler being damaged! Can be twisted and reused at will! Perfect helper for t-shirt business. Perfect Alignment:T-Shirt Ruler Guide helps to align designs to t-shirts, getting your prints perfectly aligned every time and taking the guesswork out of aligning your transfers! Never worry about things not centered in your mind again! Easy to Use: Black numbers and markers are clearly displayed on the white ruler, easy to read any shirt color. Just line up the ruler on the t-shirt collar and design by the center. Meet a variety of needs: Four kinds of rulers, including adults, young children, infants, meet different needs. The ruler tool is great for heat presses, HTV heat transfer vinyls, vinyl presses and more. caution!! ! ]: Please remove this tool before pressing the shirt. Pressing the shirt with the calibration tool can melt the ruler and break your heat press.