Open string instantons and relative stable morphisms

A street or roller hockey puck that includes a plurality of rotational members that are supported in a ring configuration. The rotational members can be cylindrical wheels or spherical rollers. The preferred embodiment includes wheels each having an axis of rotation that is perpendicular to a plane that contains both the central axis of the ring configuration and a radius formed between the central axis and each wheel. An alternate embodiment includes spherical rollers that freely rotate within a housing and protrude through the circumferential side of the puck and at least through one of the top and bottom surfaces.

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