Looks like a Normal Leather stationary note pad.
You receive a hand made black leather note pad with brass corner pieces. Inside is a pad of plain paper. A pencil is attached along side.
With this innocent-looking pad,
You show an envelope and state that inside is a prediction. Ask different spectators to write numbers on the pad, one under the other. You don't even have to see the numbers. Someone else totals them together and you ask a member of the audience to open the envelope to show that it matches the total!
Made of genuine leather by master craftsmen.