The tougher, upgraded Certate are these Hyper Custom models. The gears are made from strengthen alloys C6191, which are used only for Saltiga Z models among Daiwa reels.
The points upgraded from the standard Certate reels are following.

1. machine-cut handles, 55mm for 2500R and 3000, 65mm for 3500 and 4000.

2.11+1 full CRBB bearings

3. Hyper Digi-Gears

4. 3500 and 4000 has power knobs

If you want to use tackle which lasts longer without failing, Hyper Custom suites you better.

RCS tuning parts fit. Spools, Handles