Wera describes this particular bit as robust against stress in hard materials and designed to reduce the risk of premature tip breakage

Colour/variant: grey (Harmaa)

Bitten er en del af Wera 867/4 Z-serien

which is explicitly stated in the datasheet

The documentation explicitly mentions use on surfaces such as rubber

Pincet 125mm MIL394101111 Wera describes this particular bitPrecision Tweezers from EREM Item No. AASASL is a 5" (5 inch) straight precision tweezer designed for precise work on small components and wires. AASASL is specified as a "5" Straight Fine Robust Tip Precision Tweezer" and is supplied by the manufacturer under the Precision Tweezers product family. Material and Construction The tweezers are made of special steel, which, according to the manufacturer, is non magnetic, non rusting, acid proof, and heat