Ranger gloves are a piece of Ranged armour that can be obtained by completing elite Treasure Trails. It's part of the ranger kit and at least 40 Ranged is required to wear these gloves, with no Defence requirement.
Their attack bonuses match those of a set of black d'hide vambraces, however, their defensive stats are significantly lower.
For a brief period of five days, ranger gloves saw a sharp increase in price and trade volume as a result of the gloves being planned to be used as a component in creating vampyrium vambraces, a potential reward from the Theatre of Blood. The vampyrium vambraces failed its poll with 71.8% votes yes, 3.2% short of the 75% supermajority required for the item to enter the game.
During this period between 7 March 2018 and 12 March 2018, units of ranger gloves were sold for as much as 19 million coins, ten times the gloves' normal price. Trade volume for the gloves was as high as 2,179 units during this period, more than 8 times the gloves' normal volume. As a result of player feedback, ranger gloves were removed as a requirement for creating the vambraces, and the vambraces were polled to be dropped as a standalone item.
For an exhaustive list of all known sources for this item, see here