30 thread bobbins in plasticUPC/EAN: 4002276107069
butterflies very durable cardboard. A couple of my I'm using, after 8 years, they begin to spoil a little bit on the edges ... happy with the purchase and in fact bought back in these days to even wrap your hand-dyed yarn.
Very practical and sturdy, rewritable indefinitely, thick enough not to ruin but sharp enough to "hold" the yarn Conisgliatissime