Ds (6) has problems with fine motor control and cannot hold a pencil properly. We have tried many pencil grips and none of them really worked. And they get lost to easily (ds also has problems with organisation!)
When we saw the paediatrician he (the doc) also had poor fine motor control and needed pencil grips. On all his pens he had that plaster stuff that comes on a roll wrapped around.
Tried it on ds's pencils and it is perfect - soft and grippy. He can finally hold a pencil!