YONEX Mavis 370 Nylon Shuttlecock The Yonex Mavis 370 Shuttlecocks are hard wearing, top performing and most of all incredibly good value for money. Made of tough synthetic nylon with a natural cork base these shuttlecocks provide the truest of all flights available in a non-feather shuttle cock. Recovery Time 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 0.008 seconds faster than the recovery of an ordinary shuttlecock. Flight Pattern Developed using the flight timing of feather shuttlecocks, Mavis Nylon shuttlecocks are precision designed and manufactured to provide accurate flight performance.