This bulk pack of 2000 narrow-mouth amber HDPE reagent bottles each have a 4mL capacity and include polypropylene caps. The amber color blocks UV exposure to protect light-sensitive samples and reagents. Each bottle measures 15.9mm in diameter and 41mm tall, with an 8.3mm narrow neck. The HDPE construction provides excellent chemical resistance with a temperature range of -100°C to 120°C. Bottles are leak-proof tested. Non-sterile and non-autoclavable. Suitable for laboratories needing very large quantities of small bottles for light-sensitive sample storage.