These are our "zebra" silkworm eggs, these produce sex limited zebra marked female and pure white male silkworms. These are the same eggs we hatch here for our zebra silkworms that we ship all over the US. These eggs are good for any use, and will produce white cocoons or silk for those who use them for silk. These work best for those of you looking to reproduce your own eggs because you can tell the sex at about 1 week. These silkworms are much stronger and disease resistant then any others available.