Composed of 2 separate pieces (cover frame + Saddle) can be used with the 2 springs supplied or directly attached to the frame. ABS base, leather covering ecological. Part of supply: n. 1 saddle, n. 1 base to be fixed to the frame, n. 2 springs hairpin, n. 2 different brackets for fastening the front part to the frame. Padding Thickness 20mm. Measures as the photo.