This Hand Grip Set from the good people at Kaiko is a 5 piece Exerciser & Fidgeting Sensory Tool Kit.
This set is ideally suited to tween, teens and adults who are needing tp develop that hand muscle strength for writing, getting ready for exams, or increasing general hand strength for sports.
Great to keep on a desk at home or school for older kids to channel their hormones and emotions into but squeezing, pressing and pulling (rather than throwing the desk or other items).
In addition to the sensory benefits, this kit is also great for hand function, hand strengthening and hand exercises. This kid has been used effectively in dementia care also, especially (but not exclusively) for men.