○If you can consistently hit a 30cm putt, your distance will definitely increase. By Shinichi Arai. ¥850 (tax excluded). ○Even those who are bad at sports can score in the 70s! Just one golf theory. By Ken Miura (System Golf Researcher). ¥857 (tax excluded). *These are golf swing theory books with slightly different titles. They approach the subject from a slightly different angle than general golf swing theories, so I think you will enjoy them. I am selling them after reading them once, so they are almost as good as new, but please consider them if you understand that they are used items.