Inquiry about Soft Dark Black Charcoal Pencil NEW

I am looking for a very soft and extremely dark black charcoal pencil for an artist who offers courses in creating pet portraits. The materials are provided to students during these courses. We need a sample to evaluate the color and softness before placing orders. The sample should be delivered to a location in Western Germany. If the quality meets our requirements, we would like to cooperate with a manufacturer who can produce the pencils under our own brand and supply them regularly, primarily to the German-speaking European market.