Backs four barks tea consists of willow, oak, elm and buckthorn bark. It has a purifying and anti-inflammatory effect. Backs Four Barks Tea puts the pigeons in a good state of health, so that downy moulting gets under way as smoothly as possible but without bringing the pigeons into form during their rest period. Thanks to the willow bark it contains, Backs Four Barks Tea is ideally suited to winter treatment.