Below are the new recommended weight classes for both men and women:

MEN’S DIVISIONS

Flyweight (Up to 105 pounds)

Super Flyweight (Over 105.1 to 115 lbs)

Bantamweight (Over 115.1 to 125 lbs)

Super Bantamweight (Over 125.1 to 135
lbs)

Featherweight (Over 135.1 to 145 lbs)

Lightweight (Over 145.1 to 155 lbs)

Super Lightweight (Over 155.1 to 165
lbs)

Welterweight (Over 165.1 to 175 lbs)

Super Welterweight (Over 175.1 to 185 lbs)

Middleweight (Over 185.1 to 195 lbs)

Super Middleweight (Over 195.1 to 205 lbs)

Light Heavyweight (Over 205.1 to 225
lbs)

Heavyweight (Over 225.1 to 265 lbs)

Super Heavyweight (Over 265.1 pounds)

WOMEN’S DIVISIONS

Flyweight (95 lbs. and below)

Bantamweight (95.1-105 lbs.)

Featherweight (105.1-115 lbs.)

Lightweight (115.1-125 lbs.)

Welterweight (125.1-135 lbs.)

Middleweight (135.1-145 lbs.)

Light Heavyweight (145.1-155 lbs.)

Cruiserweight (155.1-165 lbs.)

Heavyweight (165.1-185 lbs.)

Super Heavyweight (185.1 and above)

Below are changes to the unified rules:

What was removed?

Striking downward using the point of the elbow.

For historical significance, this rule was based on a technique (a downward elbow strike) that was targeted to the back of an opponent’s head. Instead of identifying that the actual target location (back of the head) was at issue and a cause for concern, the consensus was to prohibit the technique itself.
However, there is already a rule prohibiting strikes to the spine and the back of the head, which is significant in that it prohibits ALL strikes to spine and the back of the head, bringing clarity to this issue, in a single rule.
Downward elbow strikes are no more or less damaging than any other elbow strike,(and elbow strikes are considered legal techniques). This rule has been confusing to officials, fighters, and Commissions.

Grabbing the clavicle

Grabbing the clavicle does little in terms of a direct attack that is likely to produce any injury, specifically a clavicle fracture. Clavicle fractures generally occur from a bad fall or a strong direct blow. Since throws and takedowns are allowed in MMA, as are strikes all of which have a greater probability of creating a collar injury, then this foul serves as being pointless and a bit of overkill.