The Lightest In The Petzl Range! Verso Is An Easy-to-use Belay Device. With It, You Can Belay A Climber Or Rappel. The Specific Design Allows The Rope To Glide Smoothly Through The Device And Reduces Wear. It Is Compatible With Most Rope Diameters: Single 8.5 To 10.5 Mm, Half 7.1 To 9.2 Mm, And Twin 6.9 To 9.2 Mm.