This set of bolts and covers are CNC produced out of Ti-6AL-4V. It’s the direct replacement to the original Brompton bolts that were mounted on the original square taper bottom bracket.
Its net weight is 20.1 grams/pair. It saves just over 10 grams over the original Brompton parts.
Net weight: 21.0 (+/- 1) grams/set
Original parts weight: 30.4 grams/set