I stumbled across this on Amazon. I really prefer rubber to plastic when I'm not using my scuttle. I think that rubber retains heat better than plastic. I also prefer short handle brushes, so the Marvy mug, which is excellent, just doesn't work well for me. Since they have ignored my request to manufacturer a shorter mug, I keep looking for the perfect bowl. So I found a "Dental Lab Rubber Mixing Bowl" by Easyinsmile in the large size. It cost me $13.00. It worked very well. It seemed to retain some warmth between the 1st and 2nd lathering. If it were thicker I know it would. I might just use my infrared thermometer to measure the difference this weekend between this and my Yates bowl. Being flexible, it fits well in the hand. No need to clamp down on it to keep it in the hand. The inner surface is smooth. I wondered how it would later when I bought it. No issues with lathering at all. If one was wanting some texture I would imagine that several drops from a hot glue gun would do the trick, but I really don't think it is necessary. Pics below. For size reference, the brushes used in the pics are my Semogue 830 and my Zenith M18. I'm not sure what the rules are for links to other sellers but if you ping me I'll share the addy if you can't find it on Amazon.