BE WARNED my fellow bass players before you make the same mistake. Last year, I wanted a gig bag for my 6 string Ken Smith. After doing my research I decided to purchase the MONO M80 gig bag. There were a few comments out there stating that the neck support created black stains that would not come off. So I reached out to MONO early October 2014 and inquired about the issue. They proceeded to state that issue was fixed and it was only causing in the Vertigo cases. So I bought the M80 in November 2014, and was happy with it till Friday 04/24/2015 after I noticed that BLACK STAIN on the neck of my bass. (SHAME ON ME FOR TRUSTING MONO) Long story short, I emailed MONO the same day (04/24/2015). They are going to refund me for my money spent, but they are not willing to fix the stain caused on my expensive bass. Folks make sure if you have an expensive bass, especially it uses sensitive finishes like the Ken Smith basses do; DO NOT purchase this case. It will ruin the finish and MONO will not hold themselves liable for ruining the finish. I provided the feedback that they need to updated their product guide to indicate that it can cause damage to some finishes, but I strongly doubt that they will. I’m very disappointed at their approach to the issue. They are very polite, but the correct thing would be to take full responsibility and have this ugly stain removed from my bass. Attached are 3 pictures but they don't do justice to the damage! In person it's pretty visible! In the 3rd picture you can see the dark shadow. It was worse but I managed to polish some of it out. Cheers Friends!