The yonex aerosensa as 30 shuttlecocks are manufactured to the highest standards and constructed using top grade materials they provide excellent resilience which helps ensure that you will not need to replace them as often as other similar shuttlecocks additionally the shuttlecocks are designed to be suitable for various playing conditions and provide good flight stability over distance they are perfect both for club and competition use and come in a 50 dozen box 600 shuttlecocks