Are There Different Sizes Of Ethernet Cables?

Are There Different Sizes Of Ethernet Cables? Cables are widely available in a variety of lengths: 0.5, 1, 1.5, 2, 5, 10, 20 metres are very common. Long Ethernet cables are widely available, maximum lengths of around 75 metres are relatively easy to find. What is the smaller Ethernet cable called? Telephones use an RJ11/RJ12