How to Paint Plaid on Wood Letters

Dawn at www.craftcuts.com/ shows how to paint plaid patterns on wood letters with just a little tape.
Questions?
Contact: 800-721-0566 or [e-mail]
Supplies:
Unpainted Wood Letters (www.craftcuts.c...)
Delta Ceramcoat: Angelic Blue, White, Spice Brown, Trail Tan
1" Foam Brush
3/4" Flat Brush
Royal #10 Soft Grip White Nylon Round Brush
Liner Brush
1/4" E-Z Mask Tape
1/2" Masking Tape
220 Grit Sandpaper
Liquitex Gloss Medium & Varnish
Paper Plate
Paper Towels
Water

[@cindystokes6434]

Where can I purchase 1/4” and 1/2” tape like you use?