Kit Refill Packages include three (3) Natural1 Nano-Hybrid Composit Adult Posterior Crown Shells. See Details for Sizes.Natural 1 (Lower Molar & Bicuspid sizes 18 - 31) $36.00 Regular Price$7.80Sale PriceTooth #*SelectSize*SelectQuantity*Add to CartDetailsLong Term Composite Crown Shells Lower Left NAT18 - Molar NAT19 - Molar NAT20 - Bicuspid NAT21 - Bicuspid Lower Right NAT28 - Bicuspid NAT29 - Bicuspid NAT30 - Molar NAT31 - Molar