This listing is for a Buffet Crampon & Cie. barrel for Bb soprano clarinet. It is stamped "R13 B 660" on the back with a green dot above these markings. It is for a key of Bb R13 model, and the dot indicates it is for a 'Greenline' (wood/polycarbonate blend) version. It is 66mm in length, which is the standard length for an R13.
This barrel is in excellent used condition. There are no cracks, chips, or other damage. There are no scratches/scuffs. The rings aren't loose.