The Dr. JB Switchable 32 oz Jar Only is a step up from the original 16 ounce Dr JB's Hummingbird Feeder system! Once your favorite backyard Hummingbirds arrive, instead of filling your feeder numerous times a day, simply switch out the bottle with the 32 ounce jar! Using the base from your Dr. JB Hummingbird Feeder (SE6002- All Red; SE6002W All Red with Window Hanger; SE6006 Original Dr. JB; SE6018 All Red Feeder with Yellow Flowers; SE6026 All Red 48 oz Feeder; SE6027 All Red 80 oz Feeder), just change the jar to meet the needs of your thirsty Hummingbirds! With the same wide-mouth design as the original 16 ounce, this jar is easy to clean & easy to fill. Material: High-grade, heavy-duty plastic which is very resistant to breakage. These jars are unbreakable (stronger than glass) while offering easy clean wide opening.