Strata Men's Jet Golf Balls-Pack of 15 Launch Technology Core: High Energy Core Is Designed For Maximum Launch Speed And Extreme Distance, Provides Strong Ball Flight In All Playing Conditions Durable Ionomer Cover: Ionomer Cover Blend Is Extremely Durable And Promotes Lower Driver Spin For Longer Drives Two Color Options: Available In A Traditional White Or Optical Yellow Cover For Greater Visibility In The Air Or On The Ground