We have tried: We use these pins in our sewing workshop. They are extra long, sharp and firm, so they do not bend easily. Due to their size, they are suitable for pinning bulkier materials, batting, fleece and fabrics with a loose weave. They are not suitable for pinning very fine materials, where they could leave a visible hole in the material due to their thickness. Pins are an indispensable assistant for seamstresses, patchwork artists, tailors. Without them, it would be difficult to achieve precision in joints and seams when sewing.