A plastic lens in the deepest meaning of the word. Plastic case, plastic "glass", plastic mount, plastic everything. An a really shitty image quality, but that's the whole idea. The focus mechanism is crude and anything but smooth, but the sticker with the scale is fantastic.
Holga Lens for Nikon DSLR Cameras - HL-N
Holga
Nikon
Yes
Special purpose
Both
50