Please choose any 4 nuts for guitar and bass from the 6 materials listed below. If you need more than 4, please send a message. Dimensions of each material (width - maximum height - thickness mm) Delrin Black: 43.5-8.2-5.0 Delrin White: 42.5-9.2-5.0, with radius on top Brass: 43.2-8.0-5.0, with radius on top Graphite: 43.5-5.6-3.2, bottom radius approx. 300R Carbon Short: 48.6-10.1-5.1 Carbon Long: 59.0-8.3-5.0 After purchase, please specify your combination in a message. Carbon is the most economical option if you are only considering price. Thank you for your consideration.