Huzzle Coil Puzzle
It appears to be a box-like lump with a hole, but it's actually comprised of 2 coiled up (virtually) identical pieces. Try to take it apart by sliding and rotating the pieces. Although the pieces are angular in shape, they can be rotated in unexpected ways, making their movements quite intriguing. The theme of the puzzle is “Loops”. Created by Edi Nagata of Japan for Hanayama.
Hanayama is a Japanese toy company formed in 1972. They are best known for their "Cast" series of cast metal puzzles which include reproductions of older designs, and new puzzles by designers Oskar van Diventer and Akio Yamamoto. Hanayama rate their puzzles with a difficulty level ranging from 1 to 6. The difficulty increases as the number ascends.