These are polyester Windhorse Prayer flags. These prayer flags have 10 sheets of polyester flags in each roll and the packet contains 5 rolls with 50 flags.

Size: 12.2 x 11.5 cm or 4.8" H X 4.5" W
Total Length with Strings=46 inches
Weighs 100 grams.

When the prayer flags and mantras have faded away, put up a new prayer flag. If you no longer want the old one to keep hanging alongside the new one, kindly burn or bury them respectfully.