The present invention relates to an unevenly weighted practice ball for sports (e.g., lacrosse) that, when used in training (e.g., in conjunction with a pitch back or rebounder), delivers the ball unpredictably to a player so that the player can improve their catching and reaction skills. Where the total weight of the practice ball is greater than that of a corresponding regulation ball, the player will also be benefitting from strength training.

A ball (e.g., baseball or softball) training device features a ball and at least one weight positioned along either a first axis or second axis of the ball. Use of the ball training device improves both spin rates and spin efficiency for pitchers by providing proprioceptive feedback about the break of the ball as it is released from the hand.

A ball (e.g., baseball or softball) training device features a ball and at least one weight positioned along either a first axis or second axis of the ball. Use of the ball training device improves both spin rates and spin efficiency for pitchers by providing proprioceptive feedback about the break of the ball as it is released from the hand.

This ball for ball game includes: a spherical skin portion formed to be transparent at least partially so that inside of an internal space is visible from outside; a tubular retention portion provided in the internal space and extending so as to connect two poles of the skin portion, the tubular retention portion having a surrounded space therein; and a retained object retained in a visible state between the two poles in the surrounded space. The tubular retention portion has a shape helically twisted between the two poles. The tubular retention portion is twisted with an angle not less than 135 and not greater than 270 between the two poles.

This ball for ball game includes: a spherical skin portion formed to be transparent at least partially so that inside of an internal space is visible from outside; a tubular retention portion provided in the internal space and extending so as to connect two poles of the skin portion, the tubular retention portion having a surrounded space therein; and a retained object retained in a visible state between the two poles in the surrounded space. The tubular retention portion has a shape helically twisted between the two poles. The tubular retention portion is twisted with an angle not less than 135 and not greater than 270 between the two poles.

A spherical structure having a raised texture includes a sphere and a plurality of protruding bumps. The plurality of protruding bumps are formed in pairs and in a curved arrangement on a surface of the sphere. A protruding strip that is curved is formed on the surface of the sphere, and the plurality of protruding bumps are arranged in pairs on the protruding strip on the surface of the sphere.

A spherical structure having a raised texture includes a sphere and a plurality of protruding bumps. The plurality of protruding bumps are formed in pairs and in a curved arrangement on a surface of the sphere. A protruding strip that is curved is formed on the surface of the sphere, and the plurality of protruding bumps are arranged in pairs on the protruding strip on the surface of the sphere.

A toy ball includes an clastic shell that defines a receiving cavity and an actuation module mounted in the cavity. The actuation module is detachably connected to the clastic shell and provides driving force to roll and/or enhance bouncing. The clastic shell includes expanded thermoplastic polyurethane (E-TPU) to provide low weight, high rebound, and compressive resistance.

A toy ball includes an clastic shell that defines a receiving cavity and an actuation module mounted in the cavity. The actuation module is detachably connected to the clastic shell and provides driving force to roll and/or enhance bouncing. The clastic shell includes expanded thermoplastic polyurethane (E-TPU) to provide low weight, high rebound, and compressive resistance.

At least one device is mounted on or over the bladder wall of an inflatable ball such that a center of mass of the device is located away from a center of the inflatable interior of the ball. The device includes an electronic device. The center of mass of the device defines a first point on the bladder wall coincident with or closest to the center of mass of the device and a second point on the bladder wall opposite the first point. The ball comprises a distributed balancing mass for at least partially rotationally balancing the mass of the device. The distributed balancing mass comprises one or more balancing mass elements on or over the bladder wall. The balancing mass elements are arranged at a plurality of locations spaced around the second point on the bladder wall and closer to the second point than the first point.