Abstract: A hockey puck for playing on a non-ice surface includes an outer ring within which is held a center element. The outer ring includes low friction sliding elements mounted therein. The center element is interchangeable to center elements of different weights, hardnesses and flexibility to vary the playing characteristics of the puck. Center elements with gaps between the center element and the outer ring or with additional weights or liquid are also provided.

Abstract: A hockey puck for street hockey or roller hockey has a cylindrical body with a hollow interior having liquid in the interior. Another embodiment provides a baffle in the interior of the hollow body to control the flow of the liquid within the cylindrical body. A further embodiment provides low friction slider members on the end faces of the puck. The slider members are arcuate shaped and are arranged around the periphery of the top and bottom surfaces of the puck. In a further embodiment, the slider members wrap around the edges of the puck onto the cylindrical side. The slider members can be used with or without the liquid containing interior space. Another embodiment provides a shock absorbing center portion in the form of a central core with flexible spokes extending between the core and an outer ring.

Abstract: A sport ball for use as a puck in roller hockey or street hockey has a substantially smooth spherical outer surface and a substantially smooth inner surface. The hollow interior is filled to 10 to 25% with a liquid, such as water.