Product Name: Two-part carbonless introduction letter Size: B5 size (182 x 257mm) Quantity: 50 sets Features: The first sheet is a thin paper for the copy (0.06mm). The second sheet is for sending and uses thicker paper (0.08mm) than copy paper. There is space in the lower right corner for a rubber stamp. Notes (Points of use) When writing, insert the included cardboard as a backing under the second sheet to prevent the writing from transferring to the lower sheet. Store horizontally, avoiding high temperatures, humidity, and direct sunlight. Thank you for viewing.