Brazilian terrestrials, fast growing, large, and among the most enthusiastic urticating hair kickers in the hobby. N. chromatus and N. tripepii are the common ones.
The hair is the defining trait. These animals flick at the slightest provocation and the hairs are potent enough that keepers with sensitive skin genuinely avoid the genus. Handle the enclosure, not the spider, and rehouse with a face covering if you have reacted before.
They grow quickly for New World terrestrials, reach six or seven inches, and breed readily, which keeps supply high and prices low. Good value per inch of spider, if you can tolerate the hairs. The market treats them as a budget alternative to Lasiodora and prices track accordingly.