yonex mavis 350 nylon shuttlecock with blue cap (yellow) yonex the yonex mavis 350 green cap nylon shuttlecock has been precision built to offer superior flight performance once it strikes the racquet. it has been designed to allow you to serve at a variety of speeds including slow, fast and medium serves. whether you are using it for everyday practice or for a competitive game, this yonex mavis 350 green shuttlecock moves accurately and reliably during the badminton match. the bright yellow colour of the shuttlecock makes it easy to spot and locate and ensures you never miss out on a shot