The new rigid B5 carbon/GRP seat weighs a little over 9 lbs and was originally designed to fit the very narrow Lotus Elise / Exige. The seat angle is a regular road car angle, though each bracket option allows for a significant amount of tilt. The seat material is GRP (Glass Reinforced Plastic), which is extremely sturdy yet economical, with a layer of carbon fiber on the seating surface. The carbon fiber outer is visually appealing and somewhat more resistant to wear and tear than the black/GRP gelcoat finish.