This is a CER 10PF 1.5KV NP0 1210 ceramic capacitor with a capacitance of 10 pF and a tolerance of ±10%. It has a working voltage rating of 1500V (1.5kV) and is classified as a C0G, or NP0, type capacitor in the 1210 package size, which is also known as 3225 metric.