Stronger than standard natural HDPE bottles - will not split, deform or indent. No discoloration of contents. Airtight, leak-proof seal - ideal bottles for product storage and organisation Large area for labelling. Made of environmentally-friendly, durable and recyclable HDPE (high-density polyethylene) Used by car detailers, crafters, schools, laboratories, engineering and manufacturing firms, commercial cleaners and kitchens. Great too for laundry and detergent and fabric softener For household chemicals and detergents, oils, toiletries, cosmetics, poster paint, industrial and agricultural products, inks, adhesives and beauty products Standard 28 mm (28/410) bottle neck means that bottles work with many different heads, interchangeable closures and attachments