Sika - Polyethylene Foam - Closed Cell Backer Rod (Gray) - to Fill Joints and Cracks Before applying sealant - Water-Resistant, Flexible - 3/4" Diameter x 20' ft. Long

This is the perfect size for ear posting. I premeasure and cut about 6" pieces. The only thing I don't like is that it's packaged in a coil, so the pieces end up in a curve. You have to reshape the piece and then tape it before posting your Doberman's ears. They are lightweight and durable.

We had an expansion joint that needed to be replaced. Whatever was used previously disintegrated and had to be removed. The gap (over 1/2 inch) was cleaned thoroughly and ready to be filled. The backer rod was easy to use. I slowly pushed it between the gap so there's a snug fit. Afterward, I squeezed self leveling sealant and it flowed smoothly across the gap.No issues with the backer rod. Just make sure it's not punctured while pushing it into the gap.

Good backer rod. Closed cell and dense. The correct diameter. Seems very well made. Buy and use with confidence.

It's basically dense styrofoam with great elasticity that allows you to squeeze it into cracks. It works well as intended. It doesn't rip off easily, which is what you want.

Very good quality for stopping air flow around doors and windowes.

Cheaper and better variety than what I can get locally in rural Alaska. Its backer rod, no issues.

I have several leaky spots in my house from settling. I didn't want to use spray in foam as it is so messy. The main reason I bought this was for a sliding French door that I can't quite get latched tightly enough. I don't want to have a contractor have my house opened up to fix this in dead winter. Especially when it's been below 10 degrees for the last week. This filled the bill quite nicely. Easy to use and about the same price or slightly less than the big box stores.

did the job