The function of both Roundjolly profiles is that of protecting external wall corners by forming a rounded corner. In particular, Roundjolly RJE has a completely closed curve, and it’s more economical. The Roundjolly RJ, on the other hand, has a more open curve, which allows the adhesive to penetrate into the profile, guaranteeing a stronger installation. For this very reason Roundjolly RJ has more available finishes.