This Carbon fiber ring is handcrafted from real Carbon fiber and real Marble Rings shown are approx. 3 mm wide & size 6 and 7 mm wide & Size 8.5 The ring is presented in Cherry Rosewood wood ring box. PLEASE NOTES: (1) Marble shade and color varies from piece to piece. Your ring may not look exactly like the one pictured . (2) The carbon fiber rings are not adjustable, and cannot be re-sized, so please be sure of the correct sizing you need (If you don’t know your size, it is recommended that you visit any jewelry store before ordering to get professionally sized) I can make wood rings in ¼ and ½ sizes, as well. (3)Please allow 5 to 7 days for me to get your ring made and finished before shipping it out. If you have any questions please get in touch and I will be happy to help you with them.