spikes, anti birds and cats

The aim of this piece is to prevent the neighbor's cat comes to shit on your terrace.
This is a piece spiked to place on the walls of the terraces and prevent cats to cross walk around the edge of the wall or perching birds.
This piece prevents that the animals can pass through the area but do not cause any damage. The surface is designed so that a cat does not find place to tread but the tips are wide enough so that the could not nail.
The pieces can be printed in pairs on a printer and can