Made from concrete with a sturdy wooden backing, this solid house martin nest cup is a simple yet effective way of welcoming these beautiful birds to your garden, as well as providing them with shelter from the elements. Best placed up against the eaves of a building to help protect any residents from predators, the concrete bowl is natural in appearance & features a pre-drilled drainage hole. The wooden backing board has been pre-drilled as well, aiding installation, and fixing screws are included.