This is a set of 8 "NA Arm O-rings" from Nauticam. 4 are new and unused, and 4 have been used a few times. *For convenience, the brand is listed as "INON," but this product is not an INON product. Please note. *This is a used item, so please understand before purchasing. *Please refrain from price negotiations. We will consider a price reduction only if you purchase multiple items, based on the reduced shipping cost. *Due to work or travel, we may not be able to ship within the specified number of days. Please understand. Please read the notes regarding shipping dates in the profile section. Diving Scuba Diving Underwater Photography Underwater Shooting Underwater Camera Housing Port Gear Strobe Arm Marelux Retra Backscatter INON Sea & Sea Nauticam ULTRALIGHT FLEX-ARM fisheye UN RGBlue bigblue