Wooden Material: The wooden ruler has smooth edges, sturdy and , , and simple layout, allowing you to effortlessly explore a variety of color patterns and experiment with different yarn swatches. Perfect tool for hand knitting. Wooden Color Chart Tool: The package includes wooden temperature blanket reusable color charts, providing you with a convenient and organized way to keep track of your color scheme. Scale: Each board has 10+1 holes and temperature zones, -5°~96° scale markings, the back side is blank so you can make some important markings. It is a convenient tool for craft lovers! Convenient: This multifunctional temperature blanket color card can be used as a blanket or other knitting project planner and wool color card organizer, a must-have tool for all your knitting, crochet and wool related projects!, Manufacturer: Akfldms