Luffa is a genus of tropical and subtropical vines in the cucumber family. In everyday non-technical usage, the luffa, also spelled loofah, usually refers to the fruit of the two species L. aegyptiaca and L. acutangula. The fruit of these species is cultivated and eaten as a vegetable.(Wikipedia)
Luffa are great for exfoliating, dishes and cleaning. Add some water and they will soften up. Ordinary sponges are great except they are bad for the environment. Switch to luffa. They work just as great. Compostable. Soft enough for your glass and rough enough for your pots and pans.
Make sure you let then dry once you are done. If dried properly they will ask up to three months.
About 5 inches long. No seeds.