These are updated versions of a standard Harshaw TLD hanger. They have the same filtration as a 8805 or 8810 hanger, but are MUCH easier to open and close. These can be supplied new or used. They have an outer shell that you can put a label on, and an internal filter pack that provides the extra filtration to achieve the desired operational characteristics of Harshaw dosimeters.
These work with 7776, 7777, 1110, 0110, 7776H cards providing the following filtration:
E1- 1000mg/cm^2 ABS
E2 300 mg/cm^2 Cu and Plastic
E3 7.5 mg/cm^2 Aluminized Mylar
E4 300 mg/cm^2 plastic.