Mitragyna speciosa is an evergreen tree that can grow to a height of 25 m (82 ft) tall and the trunk may grow to a 3 ft (0.91 m) diameter. The trunk is generally straight and the outer bark is smooth and grey.
Overall though, metal is a much better option than plastic. In most cases, it is much more effective and reliable, and the right choice of metal will avoid the pitfalls of rust or weakness. Aluminium, steel and stainless steel are the three metal gutter materials for guards that homeowners can choose from.
My impressions of gutter guard are: 1  Cheap plastic mesh is worse than nothing. 2  Good quality guard that covers the entire gutter, and over the top of the first row of tiles is ok. 3  A good alternative is Brushtail.  If you have pine needles falling on the roof and gutters, don't use any 1  guard. No leaf guard is 100% perfect.