The LS-10211 from ARC Technologies, Inc. is a Microwave Absorber with Frequency 16 GHz, Insertion Loss -17 dB, Thickness 0.250 ±0.062 Inches/6.35 mm ±1.6 mm, Thickness 0.250 ±0.062 Inches, Thickness (mm) 6.35 mm ±1.6 mm. More details for LS-10211 can be seen below.