The Yonex Mavis 2000 shuttlecocks are designed for tournament & practice play in the clubs. They offer five times higher durability than an average nylon shuttlecock, which is ensured by the innovative Wing Rib technology that imitates a feather shuttlecock. These precision designed shuttlecocks recover in only 0.02 seconds & deliver an accurate flight performance. They come in a 25-dozen pack.