Unique 2 piece base. Innovative flow-control design. High-quality removable parts. Bee resistant inner base. Finally, you can clean the inside of a hummingbird feeder. Dishwasher safe (place all parts of the feeder in the top rack of the dishwasher). When using soap to hand wash the feeder, or when using a dishwasher, always follow up by rinsing with a mild bleach and water solution to rinse the parts before re-filling with sugar and water. Wide mouth jar for easy cleaning and no mess when adding sugar and water. No drip design even in high winds!