Round shields are flat shields (although there is some speculation that some may have had a slight conical shape to the shield) particulary associated with the Saxons and Vikings. They have metal bosses in the centre riveted to the wooden planked body which could be up to 95cm in diameter. Behind the shield is a wooden or metal crossbar to act as a handle. The face and back of the shield could be covered in leather and painted.
SCA round shields are typically made of plywood.