Most synthetic guts use a solid core with one or more outer wraps. While the construction and quality varies depending on the manufacturer, synthetic gut typically offers good all round playability at a slightly lower price point.

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Multifilament strings are generally softer and therefore less durable than Polyester. Multifilaments usually offer more power and comfort but less control and will wear more quickly, you will often see these strings fraying before they break rather than suddenly snapping.

Polyester / Co Polyester / monofilament strings are normally harder and more durable than multifilaments and synthetic gut strings. They offer less power and comfort but more control and will often last considerably longer.

These strings however are generally for more experienced players or those who regularly break strings.

Often these strings are shaped or "rough" so offer maximum spin.

The only non-synthetic string, natural gut is made from cow intestines.  Regarded as offering the ultimate in feel and comfort due to its elasticity. However, gut is not durable and is very expensive, meaning it is impractical for most players.

Natural gut also retains its tension and optimal playing characteristics longer than any other string type. Finally natural gut is singular in that it can hold a tight tension for control and spin without compromising comfort.

Tennis string gauges vary from 1.15mm(19G) - 1.40mm(15G)

The thicker strings offer more control and durability whereas the thinner strings offer more power and comfort. Most common are 1.25mm(17G) or 1.30mm(16G).

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Squash string gauges vary from 1.15(18G) - 1.15(17G) with both being popular choices.

The thicker gauges are more durable and offer greater control however are stiffer to use.

The thinner strings are less durable but offer more power and the potential for more spin.

Each racket has its own reccomended tension, usually this falls between 50 - 60llbs Tension however, it is very much personal preference. The lower the tension, the more power you have, the tighter the tension, the more control you have.

Aside from getting unstrung / factory strung rackets, and breaking strings, rackets should generally be restrung the same number of times in a year as the amount of times you play per week.

Polyester strings lose their tension far quicker than the others and should be restrung more regularly to maintain elasticity in the string and reduce the chances of injury.