Thank you for viewing my listing. This is a combined listing of insect breeding containers. There are two sizes, small and large, which are perfect for managing Hercules beetle larvae. Some have air holes, and some do not, but you can easily make air holes in the lids of the ones without using a drill or similar tool. The following is a size reference: Small (approx. 20cm x 13cm) ... 33 pieces Large (approx. 22cm x 15cm) ... 4 pieces Thank you. #beetle #stag beetle #Dorcus hopei #Giraffa stag beetle #Hercules beetle