Material: glass, with ferrite core inside

Size1: ferrite: 2x10mm,  tag: 4x20 mm (4?0.15mm x 20?1mm)
Size1: ferrite: 1.2x10mm, tag: 3x18mm (3?0.1mm x 18?1mm)
Other length of the glass tag available on request. 
IC Available with TK4100, ATA5567, HitagS, and other LF chips on request.