Total 1 Box. For 2nd Molar. Size From 32# to 41#. 10Sizes, 4/size, total 10X4=40 Pieces Detal Orthodontic Space Maintainer Dental Orthodontic Molar Gap Bands Preformed Space Maintainer Molar Gap Retainer Band Loop Orthodontic Brace 2nd Molar Molar Space Maintainersrefers to a device that maintains a normal physiological gap after the tooth is lost prematurely in order to maintain the vacancy, in order to prevent the adjacent tooth from tilting to the lost site and the opposite jaw tooth elongation. I it is used to maintain the premature loss The mesio-distal and vertical gaps between teeth in the dentition to maintain normal eruption of inherited permanent teeth FDA STATEMENT The sale of this item may be subject to regulation by the U.S. Food and Drug Administration and state and local regulatory agencies. If so, you can bid on this item only if you are an authorized purchaser. If the item is subject to FDA regulation, I will verify your status as an authorized purchaser of this item before shipping of the item. Folllowing are our detailed information, if any special request, you can contact us, we are the honest seller in China!