Have 12 completed 75/7600 tubes. tubes have 3 grooves total. 2 internal and 1 external. these are 6061 T6 drawn tubing and cut and grooved to Gorilla specs. these tubes are not anodized. please email Gary at [email protected] if interested. paypal and shipping not included. included zip to calculate shipping charge. paypal and shipping charged are no additional funds for me. what they charge is what you pay. thanks Gary