EcoCoconut
EcoCoconut's cleaning tools are natural-fiber by design: coconut coir bristles - naturally abrasive and non-scratch - set into handles of reclaimed rubberwood. The bottle brushes use a stainless-steel wire spine, which is unavoidable for the format and is inert and recyclable rather than plastic. Packaging is plastic-free too. Nothing in the core line relies on nylon or synthetic foam.
How clear are their specs?
States the coconut-coir bristles, reclaimed-timber handles, and the stainless wire spine on bottle brushes.