Trannies Thumbs — Leather

: For reusable patterns, many use "solid" or heavy-duty materials like posterboard or Bontex , which mimic the way leather bends during test fittings.

Based on your description, you're likely looking at items related to , where these specific terms refer to tools, techniques, and materials: Leather Tooling and "Thumb" Tools leather trannies thumbs

In leathercraft, a "thumb" usually refers to a (also called a pear shader). : For reusable patterns, many use "solid" or

"Solid paper" or specific paper types are crucial for transferring these designs: : For reusable patterns

: Books can be full leather (entirely covered) or quarter-bound , where the spine is leather and the "solid paper" or cloth covers the rest of the boards.