Amsino 5-in-1 Sterile Graduated Connector are individually packaged and sterile. These connectors work with five different sizes of tubing and can be used with 3/16", 1/4", 5/16", 3/8", and 7/17". These plastic universal tubing connectors measure 3.5" long. They are sold by the each and by the case of 100. They can also be used to connect same size tubing. Latex free. DEHP Free and BPA Free.