Using Shock Leader for Ukulele Strings A Set Using fluorocarbon shock leader, also known as fishing line, on a ukulele!? For those who want to try it out, we offer a set for sale in 80cm lengths. 1st string: 0.50mm (Blue seal) 2nd string: 0.55mm (Yellow seal) 3rd string: 0.66mm (Red seal) 4th string: 0.60mm (Green seal) Dimensions are transcribed from a fishing tackle manufacturer's catalog. Since these are unused, it may take about 1-2 weeks for the tuning to stabilize. It seems like it's good to tune your ukulele every time before playing. This is fishing tackle, so please use it at your own risk. Will fishing line actually work on my ukulele? How is the compatibility with fluorocarbon? This product is for those who are interested and want to try it out. You can also try replacing just one string, or swapping the 2nd and 4th strings, etc., without worrying about the specifications of this product. Finding the perfect combination through trial and error might be fun. Please note that the background grid sheet is not included with the product.