The Windiis a soft, bendable, single-use catheter with a rounded, smooth top. It's designed to help relieve babies of their gas in a safe and natural way. The Windiis just long enough to reach past the muscle that holds in gas, but is designed to prevent it from inserting too far. Each Windi is single use. The Windi should not be used more than 3 times in a 24 hour period and will not harm your baby if enclosed instructions are followed. Finally, relief for gassy and colicy babies!