Made to accommodate cats as large as 25 lbs. Constructed of the best available US materials, including premium 3/4" plywood floor, and hand picked American made carpet. Typically produced with a hole drilled through the floor, and the carpeted underside having a 4.5" diam. circle cut away to accept a post. Measurements: Outside diameter= 18", Inside diameter= 14.5". Outside height=6.5". Inside height=4.5". Carpet colors usually shades of beige, but can be made in gray upon request. (Washable sherpa fleece pillow optional)https://feline-design-cat-furniture.myshopify.com/products/round-crows-nest-sherpa-fleece-pillow?utm_source=copyToPasteBoard&utm_medium=product-links&utm_content=we optional.