Gentle on teeth and gums, so the retrieving can go on and on. Sog-free and washable. High visibility colors for easy finding in the grass and water. Regular ball measures 2.5" and is suitable for small to medium dogs under 40 lbs. X-Large ball measures 3.5" and is suitable for medium to large dogs over 40 lbs. XX-Large ball measures 4" and is suitable for large dogs over 40 lbs. Assorted neon colors.