Pillow cases New DIY Design Duck Dynasty Uncle Si Rectangle One 20x30 (one Side) Comfortable for Lovers and Friends Standard pillowcase is roomy in size (20'' x 30''). Best choice as a gift. Comfortable and 100% Brand New Made of 50% cotton, 50% polyester! The pattern image is only on the front side. Custom Design Your Own Personalized Rectangle Pillow. Having this soft custom pillowcase will add both comfort and style to your home.