Whether you're into bookmaking, handmade stationery, origami, or other paper-based making, a bone folder is an indispensible tool for laser-straight folds and evenly-distributed burnishing. with one pointed end and one flat-curve end, it also serves many useful purposes in conservation applications.
 
This model from Lineco feels nicely weighted in the hand and is more than 1/8" thick. The design for this product was inspired by the sewing and quilting craft where it is used to mark a distinct line in fabric without the use of chalk or pins.
 
Measures 1" x 8"