I have purchased #1, 1,5, 2 and 3, and they are all superb grippers.
These grippers seem well constructed and the knurling on the handles
is sufficient to ensure a good hold, yet not so sharp that it damages the
skin. This makes them useful for consistent, long-term training.
Also, the Strengthshop Grippers come at a very reasonable price.
I can fully recommend these grippers.