Soft Slim Extra Soft Bristles are made from a special PBT material that is more flexible, durable, and regains its shape better than regular nylon bristles. - Name: SYSTEMA Toothbrush Original Super Soft 3 pcs - Brand: SYSTEMA - Unit Amount: 3 unit(s) Benefit: Flexible durable and regains its shape better than conventional nylon bristles. How to Preserve: Store in a cool, dry place.