Keep it as simple as possible with the Perky Pet Thistle Sack! Finches can cleverly extract thistle seeds from this durable nylon sack while clinging onto the fabric. Thistle seed is not included, but it can hold up to two pounds of seed. This sack has been field tested with artwork that actually attracts finches. It's easy for multiple birds to find their place at this feeder. Eliminate the cleaning hassles you'd have with a typical tube feeder!