Most "grappling" or "MMA" style gloves will have segmented finger sections that cover to the first or second knuckle. This is to allow the person wearing them the ability to grapple while providing a little protection for their hands. The MMA style bag gloves will have a grip bar (just like standard boxing gloves) to help create a tight clenched fist when punching. The feel is similar to your standard grappling glove, but the grip bar doesn't facilitate grappling as well.
Most MMA/grappling training gloves will have a higher weight and more padding over the knuckles. This is to offer more protection to the wearer and their sparring partner. These will usually weight 2 or 3 ounces higher than standard fight gloves. These will also offer a thumb covering of some sort.
MMA fight gloves are usually full open-palm, offer no thumb cover, less padding and will weigh in at either 4 or 5 ounces (depending on glove size). These will usually offer a looser fit to accomodate some sort of hand wraps or tape.
Generally speaking, if you are getting into any sort of stand-up/striking training you want dedicated boxing style gloves and hand wraps. The gloves and wraps are there mostly to prevent the injury of your hands while hitting the pads or doing any sort of bag work. If you want a good pair that can double as sparring gloves (if you do any sparring at all), you want a pair that ways in at 16 ounces as most places will not let you spar with gloves any smaller than that.
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