Alert Evidence Bags PF30104 500mL Aerated tip protector designed for 1cm and are supplied Aerated tip protector designed for convenient Each post has various supports for adjusting the height of the barrier tape "ALERT VOID" indicating tape closure system is also an integral security feature of the Alert Evidence & Chain of Custody Bag Features range from sequential serial numbering of the bags including bar codes to the unique Alert Continuous Security roll package which maintains the serial numbers of each Alert Security Bag in numerical order a valuable tool for coordinating and maintaining multiple samples in order of collection