Much thinner than a coin, a hair bigger than a penny. Gave a smooth weakish signal. Dug a plug, went down 2 more inches to 6 inches, removed dirt with hand. Checked the hole with detector, target is deeper yet. Went down another inch , removed dirt with hand, checked hole with detector, still deeper than 7 inches. Dug another inch deeper, removed dirt with hand and finally got it at 8 inches, measured. Then I dropped a zinc penny flat in the hole and covered it. Couldn't detect it in Disc. or All Metal mode, not even a whisper. The halo effect adds detection depth it seems. Soil was mild, damp, soft, no stones, short grass. Cortes, 9 x 8 coil.