I bought two of these. One for a 5.5 x 7.5 rug, and one for a 8.5 x 12 rug. These were very easy to cut to the needed size and hold the rugs in place nicely. I LOVE that these are treated to be mold and mildew resistant, and are antimicrobial. 

Pros: Easy to trim down and keep rugs from slipping