Abstract: An injection ski comprises a pair of spaced composite elements and an expanded plastic interposed between the composite elements. The upper composite element is provided with convex portions formed thereon to prevent the composite element from sagging due to its own weight during moulding operation of the ski.

Abstract: A ski comprises an upper-surface constituting member provided with a projection which is constituted by an upper-surface member and a reinforcing member, and has the shape of a roof whose ridge is defined by the widthwise central portion of the ski. The upper-surface constituting member is formed on the upper part of the ski.

Abstract: Method of manufacturing an injection-molded ski plate comprising steps of disposing a lower side member in a lower mold, disposing an upper side member in the lower mold, disposing an upper mold formed with a concaved portion corresponding to a roof-like shape with the widthwise central part of the ski plate and injecting a foaming synthetic resin into a hollow space between the lower and upper members and harding after foaming, whereby the upper member is molded following the roof-like concaved portion so that a convexed roof-like portion is formed on the upper member.

Abstract: A golf club head comprises a shell of carbon fiber reinforced plastic having a core embedded in the shell, the side and bottom of the shell are covered with a metal sole member including its integral side and sole portions, the core is positioned and retained in said shell by inserting a projection or projections on the sole member into the core and a pocket is provided in the sole member for containing weights to be used for weight adjustment of the head or balance adjustment.

Abstract: A golf club head comprises a shell of carbon fiber reinforced plastic, a polyulethane core embedded in the shell, a metal sole member having pointed pins extending through the shell into the core to position and retaining the core in the shell and an upwardly converging neck reinforcement embedded in the neck portion of the shell.

Abstract: A golf club head comprises a shell of carbon fiber reinforced plastic having a core and a reinforcement of carbon fiber fabric embedded in the shell, the side and bottom of the shell are covered with a metal sole member including its integral side and sole portions, the core is positioned and retained in said shell by inserting a projection or projections on the sole member into the core and a pocket is provided in the sole member for containing weights to be used for weight adjustment of the head or balance adjustment.