Wallnuts

The first "new age" nuts, meaning what DMM's description says: not just wedges.

Their funny looking shape works great on irregular rock formations (see limestone and conglomerate for Greece) and very odd placement (like halfway in).

They sit everywhere, which is also a con, as sometimes they stick where you don't want them to.

Sometimes they are hard to clean but this also means that they rarely walk when you move past them.

The more sophisticated design of DMM Wallnuts makes for more placement options in my experience and the colourcoding allows you to quickly identify the right size. The irregular shape can make them a little harder to remove (as stated above) but a second armed with a nutkey can usually do the trick. Solid nuts, mix them up with some other brands to have the largest range of placement options.

Strengths:
Easy to place and hold well, I find they just seat themselves better into placements than other brands.
The groove helps to place them in rock with crystals in it such as granite as it helps ensure a large surface contact.
They are very strong and safe (Three Sigma tested), built to a very high standard.
Colour coded the same as wild country rocks and rockcentrics so you know which sizes are the same.

Weaknesses:
They can be harder to remove than WC rocks.
They cost more than some rivals.

Overall:
My favourite nuts to use and should help form the basis of any rack.
A set of 1-11 can be picked up for £60ut RRP is £75.