These disc brake pads fit a variety of Tektro brakes and offer industry leading brake compounds for consistent, confident performance. Low noise, high performance semi-metallic compound lasts longer than resin. Steel backing plate. Compatible with Tektro Volans, Auriga Twin, Auriga SUB, Auriga E-SUB, TRP Parabox 2011 Rear. Item Specifications: , CompoundSemi-Metallic, Heat SinkNo, Backing Plate MaterialSteel, Pad Shape Number29,