Heavy Duty Plastic Bottom Board with many, many incredible features.Check them out below. Removable/Reversible Mouse Guard Plugs for Reversible Mouse Guards/Entrance Reducers Embedded Mesh Inspection Board Support Molded in Soft White color Never needs painting Tough Technopolymer material; No BPA Slide out Inspection Board Self-Draining edge Security Screw holes for Ultimate Hive Stand Stainless Steel Mesh for Long Life Hive Strap notch Smooth Rounded Edges; NO Sharp Corners Security Pins for Hive Bodies Removable/Reversible Entrance Reducer Angle Self-Draining Landing Board Hive Strap Notch Hive Supports No-Slide Textured Landing Board[tab]Weight 5 lbsDimensions 24 20 6 in