Are Techspray technical brushes ESD-Safe?

Technically, none of the Techspray brushes are ESD-safe / static dissipative. The brushes with metal handles are conductive, so can be grounded (generally with a user and wrist strap). The bristles are natural material, so static neutral. That means the bristles won’t generally generate a charge, especially when wet with solvent. The brushes with wood handles are considered static neutral because wood doesn't tend to generate a charge. Horse hair and hog hair bristles are also considered static neutral, while metal bristles are conductive.