Horsehair brushes are the finest you can buy - they're tough on dirt but kind to your cloth. That's why they're the professional's choice and used in competitions all over the world.
You should brush your table on a regular basis to keep the cloth fast-paced, extend its life and to maximise your playing enjoyment.
Please note: With a new brush some bristles will come off with first use - this happens on all brushes and is normal. After a few uses it will stop shedding loose bristles.