The seal assembly includes a radial seal surface, an axial seal surface, a vent surface, and an axial preload surface.

A transition surface transferring surface (31b) is formed between a first optical surface transferring surface (31a) and an intermediate end surface transferring surface (31c) to form a transition surface.

Each of the projections includes a cam surface (15), a lock surface (16), a ramp (13), and a clamping surface (14).

The working surface includes a contact surface and a recessed surface.

The insert pocket has a bottom surface, a rear surface and a base surface.

The polishing surface layer has a polishing surface and a back surface.

A surface of the insulator and a surface of the electrical contact preferably form a substantially even surface.

A non-skid surface for containers having a generally planar base layer with an upper surface, a lower surface, and a surface area.

The cartridge pocket has a top surface, a rear supporting surface and a bottom supporting surface.

The housing has a mating face, and the mating face is joined to a top face and bottom face.

The piston includes a contact area having an unlocking surface, a failsafe surface and a locking surface.

A lens includes a light entrance surface, a light exit surface, and a side surface.

At least one micro-needle preferably includes a top surface (12), a bottom surface (14), a side surface (17), and a cavity (18) defined by an inner surface.

The substrate has a front surface, a back surface, and a curved connecting surface formed between the front surface and the back surface.

The peripheral lens comprises a peripheral entrance surface, a peripheral reflection surface and a peripheral exit surface.