Kina (Evechinus chloroticus) is a traditional seafood item (Maori: kaimoana) in New Zealand cuisine. In life, the outer shell (also called a test) is covered in soft tissue, and each of the white 'bumps' on the surface is the base of a needle-like spine.
Kina shells are hollow, but here the model has been made solid. The model also has three little coloured dots drawn onto it, which helped during the construction of the model.
Kina are an example of an invertebrate animal. Specimens like this kina model are studied by students in 199.211 Invertebrate Zoology at Massey University.