Selle Italia Flite Boost Superflow Large L3 Manga SoftTek BlkClassic Flat shape that has always distinguished the Flite family, combined with the more compact design of the Boost geometry TI 316: 7mm rails are hollow titanium, a balance of strength and light weight Manganese: 7mm rails made of a Manganese and CrMo alloy for excellent durabilty and value Fibra tek: Selle Italias latest cover material offering supreme durability and comfort Soft Tek: Polyurethane cover for high levels of comfort and durability