A set of panels including first and second panels. The first and second panels respectively include first and second edges. The first edge includes a locking strip with a locking element configured to cooperate with a locking groove at the second edge for locking the first edge to the second edge. The locking element includes a first locking surface at a first angle from a plane parallel to the first panel surface and the locking groove includes a second locking surface at a second angle from a plane parallel to the third panel surface. The first angle is different from the second angle such that the first locking surface converges towards the second locking surface at a cooperation part in a locked position. The first locking surface cooperates with the second locking surface at the cooperation part.