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.
KevlarÂ® K-159 was developed for correctional institutions as the first stab resistant fabric. This new KevlarÂ® fiber, which is 4 times thinner than typical ballistic yarns, is used for an ultra-dense weave but still maintains a strength value that is five times stronger than steel on an equal weight basis.