A Comparison of Feline Design parts vs.
Armarkat Parts

 comparison of Armarkat (left) and Feline Design components
On the left: Cross section of Armarkat tube, plastic plug, and sisal rope.

Tube walls: 1/4"
Rope diameter: 1/4"
Plug walls : 1/8"
Stapled in hard plastic.
Outside diameter: approx 3 .5"
On the right: Cross section and display of Feline Design components.
Tube walls: approx. 3/8"
Rope diameter: approx 3/8
Pine Plug depth: 1.5" 
Outside diameter: over 4.5"