there are 2 models and their sizes total 11 models:model 31 : 10 mm 12mm 14 mmmodel 32 : 8 mm 10 mm 12 mm 14 mm 15 mm 16 mm 17 mm different sizes each otherGold bracelet chains ready for 3d printing. while designing i took care about both good and light grams. I am professional jewelry designer expecialy beacelets chains and rings. I wish you like my collection.