Strings (tennis)
The material used in tennis string can significantly affect a player's performance, and even health. Several materials are used to make tennis strings. They vary in terms of elasticity, durability, rebound efficiency, tension holding capability, and manufacturing cost, among other considerations.
Guitar picking
The pros of each guitar picking style are indirectly correlated to the cons of the other.Fingerstyle players use up to four (rarely five) surfaces to strike string independently. However, that does not equate to four plectrums, since plectrums can more easily strike strings on both up and downstrokes—which is much more difficult for fingers.To achieve Tremolo effects, varied arpeggios, and rapid, fluent scale passages, the player must practice alternation, that is, plucking strings with a different finger each time. 
Using p to indicate the thumb, i the index finger, m the middle finger and a the ring finger, common alternation patterns include: