The Diamond TC Premium is made with the highest quality products. Killerspin didn’t worry about cost saving while making this premium paddle; they made this one for people who are not willing to compromise on quality one bit. You’ll understand why this is a premium paddle the first time you hold it in your hands and feel the fantastic grip. You will be even more impressed once you play a shot with it and the shot goes blazing fast. All this is possible thanks to the great construction of the paddle which uses Titanium Carbon and Fortissimo rubbers. JTTAA stands for "Japanese Table Tennis Association Approved". Paddles that are used in local and national tournaments in Japan must all be registered in the Japan Table Tennis Association. In the association they actually have crew to select blades in order to ensure the quality of the blades, both imported or locally-made, are premium. Unqualified blades are not allowed to registered. So JTTAA is indeed a sign of quality, Japanese are so conscious in their effort of quality control that the fantastic construction also makes this paddle highly durable and you will be able to reap the benefits of it for a long, long time.