The Trusti tuber significantly reduces calf stress and discomfort – Soft, flexible tube, swallows easily and the calf struggling is minimized making the process very easy to learn. Flexible tube can be held in place with one hand. Large 4 litre capacity bottle. Transparent flexible tube makes it easy to clean and monitor flow. Ergonomic bottle handle. Reliable valve – fast flow with thick colostrum. Also comes with a nipple attachment to use as a bottle.