The R4 ProTee by Royaltees Golf was designed to last an entire season, give the golfer the confidence of a consistent ball height and reduce back spin for more control. It will become a valuable piece of equipment in any golf's bag. The plastic bottom is color coded for size: White is 1/2", Blue is 1", Yellow is 1-1/2" and Orange is 2". The size of the tee is based on the length of the rubber portion of the tee which is you ball height off the ground. Rated number one by Golf Test USA. The Royaltee was tested on an Iron Byron against a wood tee and out performed the wood tee across the board. It is one of the least expensive ways to improve your game. Give the R4 a try and you'll never go back to other tees. If your R4 doesn't last one full season, please contact Royaltees Golf directly and we will replace your tee at no cost. We stand behind our product. Proud to say, Made in the USA!!!