This is a used item made by Moribei Sanbongi. It is approximately 6cm wide, 4.5cm high, and has a hole diameter of about 3cm. Please allow for some error as these measurements are approximate. I believe it is a 16g feeder. Please refrain from purchasing if you are sensitive to used items. Thank you for your understanding of used items. I am also selling other items, so please take a look if you'd like.