A gripper for holding an item formed from a pliable sheet material includes a body, a first contact member located a fixed position relative to the body, a second contact member which is movable into a closed position to fixate the sheet material between the first contact member and the second contact member, a first positioning member and a second positioning member located in a fixed position relative to the body. The second contact member is connected to a support movable along a trajectory to move the second contact member in the open position and in the closed position, the support including a third positioning member attached to the support to move along with the support, where the third positioning member is magnetically engaged by the first positioning member in the open position and by the second positioning member in the closed position.