Little Giant Snap-On Calf Nipple is specially designed to let you effectively nurse calves and other young animals. This snap-on type nipple is constructed of an exceptional rubber formula which is guaranteed tough, yet soft, to help endure aggressive nursers and younglings. It also ensures long-lasting quality and improved flexibility for an extended use. It is created for use with Little Giant Snap-On Nursing bottles model nos. 98CB and 9803CB (sold separately). It measures 1 in. diameter by 4 in. long.