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Marshland Backer rods are usually round, flexible lengths of foam that are used as a “backing” in joints or cracks to help control the amount of sealant/caulking used and create a back stop. Many sizes/diameters are available for optimal fitting to the size of the joint being sealed. Besides shape, an important attribute is the variety of foam cell structure types: closed cell, open cell. It’s important to understand that cell structure makes a critical difference when it comes to irregular joint application, the desired flexibility in the joint, or sealant being used. Backer rod material is made from polyethylene or polyurethane foam, making it compatible with the common industry joint sealants or caulking. FOR YOUR CONVENIENCE: There are many protective films Or Mobile accessories for tablets and mobile phones that we offer in the store. Please enter "Marshland + your tablet/mobile phone" to quickly find the product you want. You can clearly see the products. ?"Marshland" will do the best service for you.?