Carlton GT-4 (GT4) shuttlecocks are practice grade feather shuttlecock. The Carlton GT-4 (GT4) is perfect for club looking for inexpensive shuttlecock for training, practice, and club play.
Due to the dry weather in the United States (especially in winter), these shuttlecocks are highly recommended to be humidified 2-3 days prior of usage to increase durability.
To prolong the durability of the shuttlecocks, we highly recommend that all shuttlecocks be humidified 24-48 hours before usage. This will help increase the life/durability of the shuttlecock by up to 70%. Please check http://www.shuttlecock.com/Resources/Shuttlecock/hydrate.php for tips on hydrating shuttlecocks.