Just got done building this 9" collar with strand woven bamboo sheeting. The outside is so smooth and sleek. Inside is lined with 3/4" insulation, center board with 3-way secondary reg, ss perlick/shanks, the collar fits on top like a glove, easy on/off. The thing looks pro-class, has room to grow upto 5 cornys. Need to brew a third now!!! Rdwhahb