The ALEKO CP1020WH 10 X 20 Heavy Duty Steel Frame Carport Kit canopy measured Width: 9' 7-3/8\" from exterior of tubing to exterior of tubing. Length 19' 8'1/2\" from exterior of tubing to exterior of tubing. Height: 6' 5-3/8\" from top of base to center of side tube. Roof peak 30\" (calculated using trig). This would give 8' 11-3/8' total height, (calculated, not measured). Roof angle: 120 degrees Rafter length: 64-1/2\" The measured width and length is smaller than both the Aleko and Vevore specs, which are both 10' x 20', however, the canopy fits perfect with just the right amount of stretch. I imagine that a canopy that was actually 10'x 20' wouldn't fit, being about 4' too wide and 4\" too long for this canopy cover. Perhaps it would fit but I imagine that it would be really tight. I can't quite explain the dimensions discrepancy, but I am simply reporting what I measured and what worked for me. I am very pleased with the cover. I got the yellow, which looks really good with the white sides and front. It was less than $50 with tax and delivery; what a deal! The material is the 210g PE Woven Plastic. It feels thick and substantial. Absolutely no rain leakage. As I did with the last cover, I added additional grommets for the flaps that cover the corners down to the ground. I leave the tarp up year round and I feel that this step is necessary for durability. The grommet kit from Harbor Freight for $7 works well. I'll try to add some photos but phone issues currently. Did I mention it looks really good? I couldn't be more please with the purchase!
Delrico 
