THIS AIN'T NO SPA!

My published book's title : This ain't no spa.I want to have sole rights to market and use. It's catchy and may take off. I already have 10 shirts with the slogan and hand-crafted pens with the slogan inscribed. I also created the 5 Point Writing Tool. I'm getting a huge response since introducing a week ago. It's about to go district wide. I want to maintain the rights to the tool and the name