The Arena Master Portable Sports Floor is based on 22 mm solid hardwood floorboards, prefabricated into light weight panels. Each floor panel is easily locked into position by means of factory fitted metal brackets. Lengthwise the panels have a tongue and groove connection and at ends the panels are joined using loose tongues. Underneath each floor panel is fitted four sheets of birch plywood, 12 mm thick. These give the panels a great deal of strength and durability. The panels are reinforced in each end with aluminum profiles. The panels are installed on top of a 15 mm polyethylene foam layer to provide the correct amount of shock absorption and resilience. A transition ramp around the floor provides a strong, protective and firm edge to the perimeter.