Hi. My DS (7) has ASD and has poor fine motor skills, especially with his writing.
His O/T recommended these weights to improve his things. He used to hold his wrists up (a bit like someone playing the piano incorrectly!)and his muscle tone was very low in his wrists.
There is a wrist cuff, looks like a tubular bandage but weighted, and a hand weight, looks a bit like a fingerless glove. These fitted him when he was around 5/6. We had to order them from America, and they did help.
They no longer fit him, and I'd be happy to pass them on if anyone wants them.