Milton Deluxe Driveway Signal Hose measures 3/8" ID x 300' long and is made of SBR rubber. A hose is required to operate each driveway bell or chime in use, and Milton's patented signal hose is designed specifically to function with driveway bells and chimes in a way that ensures an instant signal every time the hose is depressed. While this hose is only available in 50' and 300' lengths (models 838 and 839), it can be cut to shorter lengths, and separate lengths of hose can be connected via a hose anchor (one anchor per connection).