Concave wooden nest insert. Ideal for breeding budgies. This item has been designed to convert the following nest boxes into budgie nests; “Plastic Nest Box With Wide Entrance” https://planetaviary.com/product/plastic-nest-box-wide-entrance/

And our “Plastic Nest Box With Round Hole Entrance”  https://planetaviary.com/product/plastic-nest-box-round-hole-entrance/

(Click on the pictures for a closer look)