This is a Gravity Type feeder for Pigeons and other bird types. This bin is essential to those who have limited time to feed their pets especially those with squabs. A full feeder bin is capable of sustaining a whole days supply of feeds/grains for nurturing breeders. A clear plastic acrylic may be inserted to the allocated slots for better view of birds to grains, and will help you monitor the bin's content.Can be printed in 4 parts and assembled using clear acrylic to serve as viewing indicator.