This is a 6.8 pF ceramic capacitor with the designation of CER 6.8PF 100V C0G/NP0 1808. It has a capacitance value of 6.8 picofarads, tolerance of ±0.25pF, and a voltage rating of 100 volts. The capacitor is of the C0G or NP0 type, which is known for its stability over temperature.