Abstract: An injection-molded enclosure made of rigid thermoplastic material includes a first part having at its periphery a wall with an inwardly, downwardly slanted inner surface and a second container portion having an inwardly, downwardly slanted periphery. The first and second parts engage with, and disengage from one another when the first and second parts are pressed together.

Abstract: A thin disc, preferably of plastic, having an outer annular area which is upwardly convex and an annular inner area integral with the outer annular area and which slopes downwardly toward the disc axis to terminate in an annular edge which defines a coaxial circular opening. The radius of the opening may vary from a quarter of an inch up to almost one-half of the radius of the complete disc. In one embodiment of the invention, where the central opening is of the larger size, a plurality of dihedral vanes may be provided to extend between an object centrally disposed in the orifice and the inner edge of the disc defining the central opening. Such vanes may either extend radially from the centrally disposed object, or may spiral outwardly therefrom, with their leading edges being thickened and similarly disposed to provide added lift to the disc when it is pitched in a spinning motion.