Abstract: A composition of matter adapted for use as a sealing material and in fabricating bushings, rider rings and structural support pads. The composition is sintered polytetrafluoroethylene (PTFE) having uniformly dispersed therein from 5 to 50 volume percent of filler particles selected from the group consisting of glass particles and mineral particles having a Rockwell C hardness of between 10 C to 50 C wherein the filler particles are present in the polytetrafluoroethylene when the sintering occurs. Lead glass, soda-lead glass and soda-lime glass are among the filler particles which are incorporated into the PTFE to form structurally strong compositions which generate low amounts of wear debris.

Abstract: A three dimensional game cube of selectively moveable surface blocks and each side of the cube comprised of a center block, four corner blocks and an edge block adjacent the center block between each pair of corner blocks, the corner and edge blocks of adjacent sides of the cube being common one with the other, the cube being truncated on three pairs of parallel planes separating the blocks moveably held in operating positions by a cross within a spherical cavity, interface sides of said surface blocks having inclined surfaces engageable for realignment and sliding one against the other.