Masai glass spacer beads are collected in Kenya or Tanzania (on the East coast of Africa). When they are collected in or near Nigeria (on the West coast of Africa), they are called Gumba, Goomba or Goombah beads.
These are white to off-white glass or porcelain beads. The larger beads are usually in a tile-bead shape, and the smaller beads are often in a more-rounded shape like a large seed bead. In the past, most of these white and off-white beads were Masai spacers from Kenya.
Either way, these beads were generally made in Europe and traded to Africa in the early 1900's. Depending on where they ended up, they are called either Masai spacers, or Goomba beads.