The present invention is directed to a squash ball warming oven. The warming oven has an internal convection heat source capable of maintaining a constant temperature over long periods of time. Removable wire racks are mounted within the warming oven. The wire racks have indentations sized and shaped to hold squash balls. Arranging the squash balls in indentations on the wire rack prevents them from touching while warming, resulting in rapid and even warming. By gently and evenly warming squash balls, performance of the ball is easily improved for players of all levels.

Structures with racket performance varied according to the configurations of cylindrical parts can be easily used. A grommet includes a cylindrical part which is mounted pierced through a through hole formed in a frame of a racket and through which a string passes. The string is extended in a tensioned state on the frame so as to form front and back faces as hitting faces. The cylindrical part includes a first formation section forming both sides of a central axis position of the cylindrical part and a second formation section rotationally shifted with reference to the central axis position by 90 degrees relative to the first formation section and forming both sides of the central axis position. One of the first and second formation sections is disposed on both sides in a front/back direction. The first and second formation sections each have a different rigidity.

A racket frame includes a frame main body having a loop shape. The frame main body is provided with a plurality of holes, a plurality of main strings extend in an up-down direction and are arranged in a right-left direction and a plurality of cross strings extend in the right-left direction and are arranged in the up-down direction. Through a common hole, out of the plurality of holes, any one of the plurality of main strings and any one of the plurality of cross strings are inserted. A shape of an inner opening of the common hole on an inner peripheral surface of the frame main body is formed such that an opening dimension in a circumferential direction of the frame main body is larger than an opening dimension in a thickness direction of the frame main body.

A physical gaming system includes a display surface, a game space assigned to the display surface, a sensor system configured to detect an impact site of an object on the display surface, an acquisition system configured to detect the position of the object and/or of a player in at least a part of the game space, and a controller configured to determine a target field on the display surface using the position, wherein the physical gaming system is configured to display the target field on the display surface and to determine whether the impact site lies in the target field.