Prologo nago evo tri40 cpc nack saddlethe nago evo tri40 cpc saddle with tirox rails this saddle is designed for triathlons with light weight strong tirox rails cpc coating and a carbon base this is a must have saddle for your race bike shape semi round end use triathlon learn more with the prologo buying guide featuresnack rail nano carbon fibre rail carbon fibre kevlar and aluminium filaments seatpost clamp area treated with the production process called braided carbon rail bcr