I use quality. 2mm mylar/plastic type stencil sheets. They are thin and flexible but not as thin as paper. They are NOT the cheap flimsy paper thin transparency sheets I've seen used before. These are the best quality material sheets I've been able to find so this is all I use.
Calligraphy Small Letter Stencil 1/2 Inch
Free Printable Big Large Letter Stencils - Free Printable Stencils
I use quality. 2mm mylar/plastic type stencil sheets. They are thin and flexible but not as thin as paper. They are NOT the cheap flimsy paper thin
Calligraphy Monogram Initial 9 Tall Alphabet Letter I Stencil on 11 x 8.5 Sheet
Shop cursive alphabet letters for Sale on Shopee Philippines
Letter Stencils - Temu
CALLIGRAPHY MONOGRAM INITIAL 9 Tall Alphabet Letter Q Stencil on
TEEN SERVICES DEPOT – One Stop Shop for Teen Programming
Letter Templates
Martha Stewart Crafts Alphabet Stencil, 32276 Italic Flourish
Stencil1 Letter Stencils 2 - Old English Calligraphy Letters & Numbers - Mylar Uppercase and Lowercase Alphabet for Hand Painting, Drawing & Cutting
Winter 2014 High Resolution - John Neal, Bookseller