Household Essentials Milled cedar blocks are small blocks of solid eastern red cedar that repels moths, mildew and mustiness. This 4-pack of cedar blocks is an ingenious way to freshen and protect your closet's precious contents. Each block has a milled surface that increases its surface area, providing stronger freshness and protection. Blocks rest inconspicuously on shelves, in drawers, in lockers and in bags. And, as always, cedar is safe for all fabrics and is Non-staining. Enjoy natural freshness in your closets and drawers, from our Household to yours. Cedar blocks are 2-3/4 in H, 2 in W and 1/2 in D.