The Sweet Hockey SkillzBall is the same weight as a puck. The Skillz stickhandling ball is ideal for working on correct stickhandling form and technique. Being able to work on stickhandling skills between regular ice times is a huge benefit to a player's development.
Stickhandling is one of those basic hockey skills that requires thousands of repetitions to perfect. And it is the training concept that repetition builds "muscle memory". All that means is that once your muscles remember how to do something then they are able to react instinctively.
And having an off-ice ball to practice stickhandling with that does not bounce around on a hard surface and has the feel of a puck is a great hockey training aid.