I bought some with a yellow flower head. I don't know what brand they were, but they are about as thick as a nail and not sharp at all. I got them for me DGD's sewing kit. I think the whole sewing machine would break if you sewed over them.The one's I have seen advertised are quite expensive. Some are $4.00 for 100, so I think I would be asking for them back too.
Sue