I purchased navy blue coroplast bases for my 2x3 guinea pig cage along with a ramp. I had already made white bases and tried many attempts to make a ramp but had no success on a making a safe ramp. I placed an order for fleece flippers from Guineapigmarket.com and didn't think my measurement were correct for the perfect fit for the flippers. I'm so glad I purchased these bases!! My measurements were off because it's easy to see that my piggy has more room to run :) I had originally made a loft for an outset ramp but when I put the ramp in her cage she had a tight squeeze to get up her ramp. She didn't show any struggle running around and flying up the ramp but she is only a couple months old. I hadn't cut the new navy loft because I was thinking of making this outset loft into an inset loft but I didn't know how. I emailed Sue and she was very quick to respond with and diagram with a note with what not what to cut. Nervous as I was, because of my track record with cutting coroplast, I had many questions. Sue recommended that I talk with Alan and he can give me a better description on how to convert my piece. Alan has patients of a Saint! He walked me through it clearly step by step. Sue and Alan provide QUALITY products with EXCELLENT customer service! My only regret was not buying the cage from them to begin with.