BirTee Pro Winter/Mat Golf Tees - 8 Pack Consistent height tees: includes 8 tees of varying height from 1/4" up to 2" with 1/4" incremental steps Works on any surface including golf courses, practice mats, gym floors, and even frozen ground Perfect for indoor golf simulators Reusable, durable, and recyclable Conforms to USGA and RCGA Rules of Golf