An eyelid speculum may include two arms each including a curved engagement member. A semipermeable body assembly or plug includes a semipermeable body which is positionable in an opening of an osmotic delivery system. The non-rotating seal portion includes a seal ring seat that is connected to the support sleeve by a frangible element. Existing elliptical cross trainers often use excessive pedal articulation which can overwork the ankle to achieve a longer stride. A substrate may be utilized to assist in delivering the anti-stick agent and the performance enhancing agent to the skin. The device is provided with one or several beads clipped between the section and the wall so as to close the gap in the zones where air diffusion should be blocked.