Compositions comprising substantially cylindrical paste extruded particles having a mathematical average length to diameter ratio of 1. A staple feeder is engaged into the staple magazine and includes a spring-biased pusher for forcing staples forwardly toward the staple drive space of the staple magazine, and for allowing the staples to be driven by the staple drive plate, and an actuating device for actuating the staple drive plate to drive the staples. A light-emitting element comprises a pixel electrode, an electroluminescent layer, a transparent electrode, a passivation film, a stress relieving layer, and a low refractive index layer, all of which are stacked sequentially.