key feature:- Yonex shuttlecocks are precision manufactured to ensure the correct speed, distance and stability performance in different temperatures and environments.Developed using the flight timing of feather shuttlecocks, Mavis Nylon Shuttlecocks are designed to provide accurate flight performance.When smashed, a Mavis Shuttlecock recovers in only 0.002 seconds- which is about only 0.005 seconds slower than that of a Yonex feather shuttlecock, and 0.008 seconds faster than that of any other shuttlecock.The combination of close-to-feather shuttlecock performance and four to five times more durability than an ordinary nylon shuttlecock