Lot of three ACT 1 dental instrument cassettes.  Fully functional.  Two of them come with two rubber dams each, the third one I comes with only one dam.  Cassettes measure 8" X 5" x 1

3/8"(exterior measurement).  The cassettes are engraved with initials and have a little bit of  masking tape residue

Made by Sutter Dental MFG Co Advanced Cassette Technology ACT 1

Each cassette holds 7 instruments