Weight: 10 lb.
Estimated Value (Sane Cost Guide): 120 gp
DMG Value: 50 gp - 100 gp
You can cut this 50-foot coil of hempen rope into any number of smaller pieces, and then use an action to speak a command word and cause the pieces to knit back together. The pieces must be in contact with each other and not otherwise in use. A rope of mending is forever shortened if a section of it is lost or destroyed.
Source: Xanathar's Guide to Everything p138