The first number is the tooth count for the gear. The numbers in brackets are the the circumference of the arc segments that the non-circular gears are made of. The 'sides' and 'corners' of the gears are made from pieces of larger and smaller circles. These numbers are helpful because it informs what size of rings the gears can roll inside of and what gears will work in the frame.
For example the 95 (150/40) gear has sides that are made from parts of a 150 circle so it will work well in rings that are larger than 150. Gears inside the 95 frame need to be smaller than 40 or they'll get caught in the corners because they are too big.
For example the 95 (150/40) gear has sides that are made from parts of a 150 circle so it will work well in rings that are larger than 150. Gears inside the 95 frame need to be smaller than 40 or they'll get caught in the corners because they are too big.