1. Material: Aluminum alloy (prevent fraying). Made of sturdy metal for strength, stability, safety and flexibility resistance. 2. Package Contents: Set of 12 safety pins, 2 each of 2.4 inches (6 cm), 3.5 inches (9 cm), 4.7 inches (12 cm), 5.9 inches (15 cm), 6.7 inches (17 cm), 7.9 inches (20 cm), total 12 3. Prevents fraying: As a safety pin to prevent fraying, it keeps the knots intact to prevent fraying. It is convenient for processing collars, shoulders, cuffs, etc. when weaving sweaters. 4. Simple and Practical: Easy and convenient locking markers, and the increment ring is attached to the position of the increment and drop. It is easy to open and close, and you can check it while weaving it smoothly. Perfect accessory for knitting, marking lines, crochet and craft projects 5. Multi-purpose: The number of steps is a lock type marker that does not slip from the knit, so you can use it safely, and if you put the number rings on the increments and decreased position, you can check it while weaving it smoothly. Useful for knitting marking, crochet, weaving, scrapbooking, DIY, crafting, crafting, etc.