[Unopened/Bonus Included] Sound Offset Spacer for Concert Ukulele SOS-UC2 (Bonus includes a cleaning cloth and a string winder. The cloth is new, and the winder shows some signs of use, but it allows for quick string winding (and unwinding). Please use it as it's convenient.) This is the one I didn't use out of the two sets I purchased. Those who are using it still love it. Highly recommended. Although unused, there are some minor scratches on the package and a fold in the bag. I will wrap it in cushioning material and ship it via Yu-Packet Post Mini (with tracking), so it will be transported by sea and land. It may take some time. Thank you for your understanding. When tuning a ukulele, for example, if you press the 3rd fret of the 1st string, the sound is off... Due to the short string length of the ukulele, this is a problem that cannot be avoided. Well, you could say that's part of the charm of the ukulele. This will improve it somewhat. It's an unprecedented and innovative product. The following is an excerpt from the manufacturer's website: Many players have given up on the idea that the pitch of fretted instruments doesn't match due to the structure. However, S.O.S. can be easily installed by the user themselves, just by inserting it between the strings and the fingerboard. Moreover, it is possible to significantly correct the pitch. Based on the MTS <Minehara Tuning System Patent No.4383272> theory, S.O.S. removes the stress of players who were struggling with tuning and brings a more beautiful harmony to the instrument. Since S.O.S. corrects the nut side, its effect is from the open string to the mid-range frets. For the area around the 12th fret and higher frets, the octave pitch of instruments that are sharp will be slightly improved, but for instruments that are flat, the pitch error tends to increase, so please be careful. In the case of an electric guitar, after installing S.O.S., adjusting the octave at the saddle will also improve the pitch of the high fret area. Note: If you can adjust the octave on the saddle side, as described in the electric guitar explanation, the pitch of the high fret area will also be improved on the ukulele. #Ukulele #Concert #PitchImprovement #Adjustment #SoundOffsetSpacer #BonusIncluded