Smooth/Textured Perforated Plastic HDPE Geocell for Retaining Wall 1.1mm-1.8mm . Brief Introduction of Geocell nfinement System. Geocell nfinement System--also known as Cellular nfinement System(CCS), it is a kind of three-dimensional network structure shaped by high-strength HDPE (high density polyethylene) sheets through ultrasonic welding of high strength.