✔[Heavy Duty]: It is a heavy duty safety pin, and its designed to take a surprising amount of strength to open, 30 grams a piece safety pin, not suitable for normal clothes. ✔[Family Daily Use]: Its usually used for heavy duty laundry, hanging heavyweight stuffs, heavyweight material like canvas, leather, vinyl and upholstery. ✔[Fine Material]: Made of stainless steel, which creates rustproof and sturdy pins. For babys safety, so it was made with locking closure. ✔[Updated Sharp Design]: The Heavy Duty Safety Pins are great for outdoor gear