This is the Pro version of the American-made Weedwacker nylon strings for double bass. It comes in a set of 4 strings: E, A, D, and G. Available colors are clear, black, gut tone, and radical red. The biggest difference from the previous Weedwacker nylon strings is that the E and A strings are thicker. This difference in specifications provides the following benefits: - Louder volume - Faster slapping - Higher tension - Shorter break-in period; strings settle in faster (the standard Weedwacker nylon strings took 2-3 weeks for the strings to stretch and the tuning to stabilize, but the Pro version settles in 2-3 days) 【Recommended for】 Those who are already using Weedwacker nylon strings and want to stabilize the tuning quickly, or want more volume from the E and A strings. 【Musicians who use them】 These strings were used by the bassists of Reverend Horton Heat and The Greyhounds during recording sessions. **What are Weedwacker nylon strings?** They have a core made of Kevlar, a strong fiber also used in bulletproof vests. Not only are they impact-resistant, but they are also strong against pulling forces, making them a high-strength product. The surface is smooth and has low tension, making them easy to slap, so they can be used in various genres such as rockabilly, psychobilly, rustic, blues, country, and bluegrass. 【Important Notes】 Since they are made of nylon, magnetic pickups cannot be used.