Transthyretin amyloidosis is a slowly progressive condition characterized by the buildup of abnormal deposits of a protein called amyloid (amyloidosis) in the body's organs and tissues.
If you play tennis, you may be familiar with the different racket customizing choices you have -- common choices include string type, gauge and tension. Not so common is an inexpensive device called a shock absorber or vibration dampener. These devices have no impact on your performance, but some players can't play without one. It's a personal choice, and if you do use a dampener, its placement must comply with the rules of the International Tennis Federation.
There are different sizes of tennis rackets starting at 19 for a young player and go up to 27 which is a full size racket. In my opinion Slazenger is a particular good brand of mini tennis racket, however your Tennis Coach will be able to advise you on a suitable brand.