Prime quality 22mm thick knot-free seasoned pine grown and milled New Zealand. Machining accurately to ensure hive stability (no wobbles here). Assembled, glued with high-temp polyurethane and screwed with 20 x 45mm galvanised steel screws so they are designed to last. Four (4) deep hand grips for easy handling. Painted with 2 coats quality acrylic so they are RTG into the field.