Zulu Nylon Strap is Very popular “Classic Bond” North Atlantic Treaty Organization Watch Strap. https://www.adband.org/products/zulu-straps/zulu-nylon-strap-nato-strap-china.html
The aluminum extrusion technology simply means that the aluminum ingots are heated at high temperature about 520-540℃, the aluminum liquid is allowed to flow through the squeeze mold with grooves under high pressure to make the heat sink embryo. Aluminium heatsink extrusion is relatively easy to implement and its equipment cost is relatively low, which makes it widely used in the market.
The most commonly used aluminum extruding material is aa6063, which has good thermal conductivity and processability. However, due to the limitation of its material, the ratio of thickness and length of the heatsink fin can not exceed 1:18. Thus it is difficult to improve the cooling area in a limited space, and it turns out that aluminum extruded heatsink fin effect is unsatisfying. It seems not surpass the CPU heat sink with high frequency in a short time.