Signature Collection engineering pads have a cloth-bound cover and heavy-weight back to give your notes extra protection and stability. Signature Collection engineering pads feature smooth, heavy-weight 20 lb paper for an extra writing experience with any writing instrument. Pad-Binding Type: Glued/Taped; Pad-Binding Edge: Top; Sheets per Pad: 80; Sheet Size (Bound-Side First): 8.5 x 11.