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. The Mavis 2000 is designed to be the ultimate practice and tournament shuttlecock for club players.. The hardness of the skirt – the feather part of the nylon shuttlecock – varies depending on temperature.. Nylon shuttles.. Innovative Wing Rib cross section means the flight path. Almost exactly mimics that of a feather shuttlecock.. Medium speed.