A cue or golf club head having a sighting aid, a golf club having the golf club head, and uses thereof.

A pool cue tip comprises a generally cylindrical portion and a spherical cap portion that meets the generally cylindrical portion at a base. The base has a diameter that is less than a diameter of the generally cylindrical portion so that the generally cylindrical portion defines an annular lip. The pool cue tip can comprise a polymeric material. The polymeric material can have a tackiness that is greater without a layer of chalk than with a layer of chalk so that the pool cue tip can be used without chalk. A pool cue can comprise a pool cue tip including one or more of such aspects.

A pool cue tip comprises a generally cylindrical portion and a spherical cap portion that meets the generally cylindrical portion at a base. The base has a diameter that is less than a diameter of the generally cylindrical portion so that the generally cylindrical portion defines an annular lip. The pool cue tip can comprise a polymeric material. The polymeric material can have a tackiness that is greater without a layer of chalk than with a layer of chalk so that the pool cue tip can be used without chalk. A pool cue can comprise a pool cue tip including one or more of such aspects.

A chalk-holder for billiard-cues system including a body having two opposing cavities. Each opposing cavity is configured with one or more frictional elements. The frictional elements of the first cavity configured to removably retain chalk. The frictional elements of the second cavity configured to removably retain a pool cue. The device may be used to store chalk between uses during billiards.

The present invention is a training device that helps the players of cue sports to realize their mistakes and improve their skills. The device comprises of a laser module that can be placed onto the cue to emit a line laser on the cue ball, the target ball and the playing surface or ground as an aiming guide. The device comprises of a self-balancing system to automatically hold the laser on top of the cue for a proper beam. The device further comprises of a control board to program different duty cycles and coaching scenarios of the device.

The present invention is a training device that helps the players of cue sports to realize their mistakes and improve their skills. The device comprises of a laser module that can be placed onto the cue to emit a line laser on the cue ball, the target ball and the playing surface or ground as an aiming guide. The device comprises of a self-balancing system to automatically hold the laser on top of the cue for a proper beam. The device further comprises of a control board to program different duty cycles and coaching scenarios of the device.

A chalk-holder for billiard-cues system including a chalk holder having a receptacle including an inner volume and a securing member. The inner volume is configured to store chalk for removeable use. The securing member is configured to engage and be secured at a handle-end of a pool cue for providing ready access to the chalk. The securing member comprises threading. The handle-end comprises an aperture configured to mate with the threading of the securing member. The device may be used to store chalk between uses during billiards.

A chalk-holder for billiard-cues system including a chalk holder having a receptacle including an inner volume and a securing member. The inner volume is configured to store chalk for removeable use. The securing member is configured to engage and be secured at a handle-end of a pool cue for providing ready access to the chalk. The securing member comprises threading. The handle-end comprises an aperture configured to mate with the threading of the securing member. The device may be used to store chalk between uses during billiards.

A passive upper extremity prosthesis for enabling a user with a residual arm to play a cue sport includes a socket that is configured to position over and to couple to a residual arm of a user. A connector that is coupled to the socket is configured to selectively couple to a cue stick to couple the socket to the cue stick, positioning the user to manipulate the cue stick to play a cue sport, such as pool and billiards.

A passive upper extremity prosthesis for enabling a user with a residual arm to play a cue sport includes a socket that is configured to position over and to couple to a residual arm of a user. A connector that is coupled to the socket is configured to selectively couple to a cue stick to couple the socket to the cue stick, positioning the user to manipulate the cue stick to play a cue sport, such as pool and billiards.