This is a box of 21 individually wrapped and measured Semimetals wafers from the 1960sThe wafers would be cut into computer dies, and used for different circuits. Solitron was an important manufacturer during the early computing yearsincluding providing components for the Nasa Apollo Program
*The photo shows 20 envelopes with 1 wafer each, but there are actually 21 and you will receive all 21. Envelopes are a 1.75" square, wafers are slightly smaller . . Hinges for plastic case are broken.