Little Giant Screw-On Calf Nipple is specially designed to let you effectively nurse calves and other young animals. This screw-on type nipple is constructed of 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 Screw-On Nipple Cap 93SC or 93SCPK (Pack of 12) (each sold separately). It measures 1 inch in diameter by 3 inch long.