Description
These are nymphs of species sungaya aeta, easy to care for and relatively long lived (2~ years). £1 per 3 stick insect nymphs, random sex, any size. Exact birth date is unknown but the first one was born about a month ago, so they're probably younger than that.
They can eat a range of leaves but I feed them on bramble which is easy to source. They need a tank or net enclosure that allows air in but can keep humidity high, but they're not too fussy. If they survive their first shed you will find subsequent sheds are easy. Losing legs early in life is common, they may partially regrow them.
From Wikipedia:
The leaves of bramble and other Rosaceae are suitable as fodder plants, as well as those of hazel, common beech and hornbeam, Norway maple, ivy, dogwood, common ash and others. To lay eggs, a slightly moist layer of earth or sand should cover the ground.
Temperatures of 22 to 27 °C (72 to 81 °F) and humidity between 60 and 80 percent are sufficient for breeding.