The 5880LZ from Rogers Corporation is a Laminate with Dk (Dielectric Constant) 2, Thickness Inches 0.010” (0256mm) ± 001, 0.020” (0.508mm) ± 001, 0.025” (0.625mm) ± 0015, 0.030” (0.762mm) ± 002, 0.040” (1.026mm) ± 002, 0.050” (1.270mm) ± 002, 0.100” (2.540mm) ± 004, Thermal Coeffecient 44, 43, 41.5 ppm/°C. More details for 5880LZ can be seen below.