Ahh...but now ... THEY ARE ONE THREAD!
One! ONE THREAD! (Insert Count Dracula maniacal laughter and lightning a la Sesame Street here)
Incidentally, I have a few of those still kicking around, too, though I eagerly switched to the dice with the printed numbers as soon as they were available (though I picked some ugly sets ... I have a couple of glitter/transparent, colored transparent, and some marbly nailpolish colors that came out).
However, I still keep a transparent, purple, white-crayon-filled d20 that I bought when I thought my cat had lost the d20 that came with my Basic D&D set. It's edges are still pretty sharp, and I think it's one of the nicest dice in my set.