as well as surface and base material for contacts

The description on the manufacturer's page clearly indicates that the cartridge is intended for the WHA900

Insulation type: PVC (reinforced insulation)

Marking: Laser-engraved size indications on the blade

Manufacturer's item number: 35216

Skævbider ESD High precision Ergo-tek Slim Unit(s):Packet as well as surface andHigh Precision Cutters from IDEAL TEK The ES5542. CR. BG is a high precision cutter from IDEAL TEK with a small, tapered, and relieved head geometry and a full flush cutting edge. The product comes with Ergo tek Slim grips and is specified as ESD safe. The description below is based on the manufacturer's official product sheet. Design and materials Blade material: High carbon chromium low alloy steel (100Cr6). Blade hardness: 67 HRC (hardened). Handle