Strong enough for use with heavyweight material like wool, leather, canvas, vinyl and upholstery. Ideal for blankets, skirts, kilts, crafts. The item is steel safety pin, ideal for blankets, skirts kilts and crafts, securing mattress pads in place and dozens of other uses. Comes in varying available colors. Great for blankets, wrap skirts/ kilts, securing mattress pads in place and dozens of other uses.