【Material】 nylon/ resin/Stainless steel
【Process】3D printing    
【Size】Please let me know your waist size after you place your order

(Note: the size of the goods due to measurement methods, measuring instruments, factory production batches of different and so there will be a small error, generally ± 2 mm error is normal, does not belong to the quality issues or size description does not match, thank you)