This is a genuine Benjamin Discovery / Maximus barrel band. It is made of blued steel. Both models in both calibers use the same part number.

 It will also fit 2240, 2260, 2300T, 2300S and Crosman Custom Shop 2300KT. On plastic breech models the barrel band sits too low causing the barrel to angle down towards the front of the tube. Steel breech models often have this same issue. Using a Discovery barrel band will lift the barrel slightly higher to be more square with the tube. It does not have a mounting tab for use with the forearm on the 2250B and 2400KT but works great if you leave that forearm off.

 The Discovery and 22XX bands are very close to the same dimensions. The standard 22XX band has a recess the Discovery band doesn't have. That recess is what causes the barrel to sit lower. You wouldn't know this by just taking a measurement, you have to actually compare the parts mounted on your airgun.