SCHNELLER SCHNALLER is a futuristic closure mechanism with which one can set and tighten a strap. By stroking over two cylindrical wheels with ones fingers the fastener slides in the required direction and accordingly tightens or loosens the belt. The system can be locked by slewing a lever into the strokes of the front wheel and thereby blocking its rotation. The filigree, open and polygonal structure of the product is manufactured with two-component-3D-printing technique.