Eco Golf (not at all affiliated with this blog) T2G Tees are made of USA grown biopolymers. Biopolymers are produced of biomass derived from such non-food crops as sugar beet, potatoes or wheat. Although these crops are notoriously resource intensive, they are fast growing and they make a product that is compostable. Wood tees are biodegradable too, however the problem with trees are that they grow slow and the tees brake apart far easier than a biopolymer based tee. Eco Golf claims that "All tees will do some damage to mowing equipment. The eco tee minimizes this damage by utilizing softer less impact resistant materials than wood".
Tees are available in 2.25", 2.75", 3" and 3.25"
Check out the selection at www.ecogolf.com