Gosen Vibless Plus . At last I'd like to mention the so called hybrid strings . They are a combination of two different strings for mains and crosses. Standard material for main strings is Aramid and its derivatives Kevlar, Technora, Zyex etc. For cross strings very elastic strings are used to compensate the lacking elasticity of the main string.
Hybrid strings perform well, only the price is often a little high.
The choice of the right tension is about as important as the choice of the racquet frame. With lower tension you gain more power but also lose control. Feel Arm shock thinner more lower more better less thicker less higher less worse more To increase the durability of your strings you should not expose your racquet to extreme heat, cold or humidity. Therefore you should always keep your racquet in its bag. To protect your racquet head you can use a head tape.