High-quality mechanical metal puzzle set. Those are the first two puzzle designs by Felix Ure (Titan puzzle and the Hip-Flask puzzle). Both puzzles are very hard to solve. 

Titan Puzzle - Very hard metal puzzle and very satisfying to solve. The goal of the puzzle is to open the sphere. The Titan brass puzzle is a simple-looking, yet highly challenging take-apart puzzle. This is the first design by Felix Ure, a puzzle designer from London that specializes in mechanical metal puzzles.

A premium mechanical brass puzzle by Felix Ure. The Hip-Flask puzzle is a multi-stage, sequential discovery puzzle.​ The objective of the puzzle is to remove the lid of the flask - but to do so you will need to solve the mechanism which keeps the lid locked. This is the second design by Felix Ure (his first design Titan puzzle).