Drive Golf&reg; Flex-Core&reg; Golf Tees Advanced Flexcore&reg; Technology Compounded Plastic Stem With Rubber Flexible Top The Best Golf Tee&trade; 2.75" Professional Golf Tees, Performance Golf Tees, Fluorescent Orange Color Tees have an elastomeric head which reduces friction Strong polymer substrate for maximum durability Flex head technology that eliminates impact resistance A spring steel core making it virtually unbreakable Tee is USGA approved and is perfect for hybrids, fairway woods, drivers, and irons.