This orchard mason bee nesting block is made in the Pacific Northwest from local hardwood. Its textured and burnished front helps the females find their way back to the their nesting hole. These nest blocks are excellent for mason-bee management. It is actually a cartridge of slotted slabs that can be opened to allow you to harvest the cocoons and clean the nest to prepare it for successful seasons year after year. The 96 hole is definitely the better value.