We offer Hummingbird Feeders Stoppers with Ball Bearing in two sizes:

HBF-114 - The conical shape of this stopper has a diameter of 1-1/8" at the bottom and 1-3/8" at the top. Tube diameter is 1/4" x 2-1/4" long. Overall length 3". Fits the Parasol feeders.

HBF-1516BB - The conical shape of this stopper has a diameter of 5/8" at the bottom and 7/8" at the top. Tube diameter is 1/4" and 2-1/2" long. Overall length 3-1/4"."

Be sure to choose USPS as a shipping option during checkout for the most economical shipping method.

TIP: Always fill your feeder completely full with cool nectar. Insert the stopper and invert quickly to avoid any air entering the feeder. Tube feeders operate on a vacuum principle. Only if the feeder is initially filled completely full will the vacuum form!