Each pole segment uses a pair of plastic plates (sleeves). Each plate has 2 raised protrusions which prevent the poles from twisting inside each other. The plates also serve to prevent the poles from sliding out of each other.
Anti-twist plates have faint markings on the round protrusion for easy identification of matching section.
Metal Knob Rubber Sleeves have marks at the inner surface for easy identification of matching section.
Rubber Cushion Rings have marks at the bottom surface for easy identification of matching section.
since 2004
