Building panel with a mechanical locking system

A set of panels comprising:

• a first panel and a second panel each comprising a main surface, a first edge, an opposite second edge, a third edge which is adjacent and optionally perpendicular to the first edge, and a fourth edge which is opposite to the third edge, wherein the panels are floorboards;
• and
• a mechanical locking device configured to lock the first edge of the first panel to the second edge of the second panel at a joint seam,
• wherein the locking device comprises a flexible tongue positioned in an insertion groove at the first edge of the first panel and a tongue groove at the second edge of the second panel,
• wherein the flexible tongue is of an elongated shape along a length direction parallel to the first edge,
• wherein the flexible tongue comprises a central part between a first edge part and a second edge part of the flexible tongue,
• wherein the central part is configured to cooperate with the tongue groove for locking of the first and the second edge in a first direction which is perpendicular to the main surface in a locked position of the first panel and the second panel,
• wherein the first edge part and the tongue groove are configured such that, when in the locked position, a force is applied adjacent the first edge and the third edge of the first panel, the first edge part is pushed towards a bottom surface of the insertion groove which allows a disassembling of the second panel from the first panel by displacing the third edge of the second panel relative the third edge of the first panel.