The BA-7112 is a 71 Series 22 gauge fine-wire 3/8" crown staple. It has a 1/2" leg length. Each box comes with 25,000 staples, and this listing comes with 8 boxes of staples (200,000 total staples). 
 
Fits these Bostitch tools: 21671B, 21671B-LM, 21671B-ALM