I think there are different weighted gloves. I have 2lb weight gloves I use for walking and kickboxing. They are a set weight.
On STS I've seen Cathe use the variable weight gloves. They have a zipper pocket that allows you to add 1 or 2 lb weights. I've ordered these (I hope) from Paragon Sports online as I'm tired of taking the weighted gloves off and on. (I'm pretty uncoordinated and getting the velcro in the slot over my weight gloves when my arms are fried within the rest period is sometimes beyond my ability ) Plus I use 1lb band weights for that increment. Creative but not quick.
I found the Paragon reference on another thread around here.