Nylon Material: These shuttlecocks are constructed from high-quality nylon, ensuring durability and consistent performance on the badminton court. Fast Recovery Time: When smashed, a Mavis shuttlecock recovers in just 0.02 seconds, which is only 0.005 seconds slower than a Yonex feather shuttlecock and 0.008 seconds faster than the recovery of an ordinary shuttlecock, making it a reliable choice for players. Temperature Categories: Yonex categorizes Mavis shuttlecocks into three temperature ranges, and the green-capped version is designed for "slow" speed gameplay in temperatures ranging from 22°C to 33°C. Country of Origin: Manufactured in Japan, these shuttlecocks come from a country renowned for its precision and high-quality badminton equipment, ensuring their reliability and performance on the court. In-box Contents: 6 Pieces (Nylon Shuttlecock)