Yonex Mavis 200i Nylon Shuttle Cock, Pack of 6 (Yellow) Developed using the flight timing of feather shuttlecocks, Mavis nylon shuttlecocks are precision designed and manufactured to provide accurate flight performance When smashed, a Mavis shuttlecock recovers in only 0.02 seconds. This performance is just 0.005 seconds slower than a Yonex feather shuttlecock and 0.08 seconds faster than the recovery of an ordinary shuttlecock The combination of close-to-feather shuttlecock flight performance and four to five times more durability than an ordinary nylon shuttlecock makes the Yonex Mavis series the most cost-effective choice for practice sessions.