Designed to be consistent and uniform, the Porter-Cable 5553 No. 20 Biscuits do not swell until they soak up water-based glues. This process ensures a more hardy wood joint and reliable results. Comprised of flattened beech wood, these handy little biscuits conform with slots made by all standard plate joiners. And since every package contains 1,000 biscuits, you"ll always have plenty on-hand.