Prologo zero ii cpc tirox saddletheprologo zero ii cpc saddlewith tirox rails is an ideal saddle for short or medium distance riding where a frequent change in position is necessary featuring unique cpc technology carbon fibre injection base and a microfibre cover shape flat end use road learn more with the prologo buying guide features tirox rail rail light alloy steel this material is highly resistant to traction and torsion for its light weight its for these reasons it is used in