This Half face respirator is made by Honeywell and is a size Small. Its model is the RU8800 and it costs about USD60. It has a Medium nose bridge height, and its facepiece is made of Silicone. The width min and max distances, in inches, curving from mid cheek to mid cheek are 3 and 4.25 respectively. The distance in inches, straight up and down in the middle along the nose line is a minimum of 2.75 and a maximum of 4.5. The average depth of the mask is 1.45 inches. You can find more information about this mask at https://sps.honeywell.com/us/en/products/safety/respiratory-protection/air-purifying-respirator-apr/honeywell-north-ru8800-half-mask. This mask weighs about 168 grams. Often cited as "extra small" - smallest I've seen