Metal and plastic. Since there is more than one brand and construction within brands varies greatly from model to model you should choose a brand and model then ask again.
Pruners are used in your garden to cut branches or stems on flowers, bushes and trees. Typically, the more expensive the cost of pruners the better the quality.
Deadheading flowers, pruning roses, and cutting back live plants are what Corona Pruners are mainly used for. These pruners are known for being of high quality.
The Fiskar pruners are very durable, but are more expensive than the Wolf Garden ones.
Felco
I have no idea.=D
Tree pruners are typically considered to be a Class 3 lever, where the effort is between the load (branch being cut) and the fulcrum (pivot point). The long handles on tree pruners provide leverage for the user to exert force on the cutting blade in order to trim branches effectively.
Yes, The Home Depot does sell garden pruners. They start at $9.97 and go up to $30. They come in mini versions as well as the full size.
When one wants to purchase Felco pruners, one can visit some Felco distributors online at places like FelcoStore, FelcoUSA, or Gardeners. If one needs parts for a Felco pruner, one can get those from an online store called NorthCoastGardening. Pruners can cut and trim your plants without destroying their stems.
They certainly serve a similar purpose. Generally speaking secateurs are used one handed and or for smaller branches. Pruners may be much larger with longer handles for tackling thicker off shoots, though this is not always the case. It may also depend on the manufacturer, some call single handed 'secateurs' pruners.
Have you ever seen just how many garden pruners there are available. There are hundreds to choose from. The thing is though, they all do the same thing. I would suggest paying no more than $5.
Discounted Felco pruners can be found for sale on the Felco website, they are an independent retail website and as a result don't stock their supplies in general hardware stores that would otherwise offer discounts
Pruning fruit trees helps the trees grow and produce more fruit. All fruit trees would benefit from some pruning with bypass pruners, but especially apple trees.