Wood Nesting Block 48 for Orchard Mason Bees makes a great habitat and is designed to be used with or without White Paper Liners. Black End Plugs can be used to block the back of each Wood Nesting Block hole. It comes in two different sizes, 48 and 96 holes (also available on this website).  Each section comes apart, making it easy to harvest your cocoons and sanitize the wood block.  Making the wood block reusable year-after-year. Recommended location is inside a Shelter 48