Each of these rare Malay fire strikers known as a gobek api is made of carved and turned horn (the darker examples) and wood (the lighter example). Each has a stupa-type shape and comprises two parts – a chamber and a pumping spindle with a handle.
Wealthy Malay men would carry such a device with them to light their cheroot of rolled tobacco in a leaf (rokok daun). The gobek api ingeniously functioned as something like a vacuum pump with the fire being obtained via air compression. Friction from vigorous pumping action would light the thin wad of cotton wound around the tip of the spindle and this would then be used to light the cheroot.
Related examples are illustrated in Noor & Khoo (2003, p. 105).
The four here are in fine condition and each has superb patina.
Noor, F. & E. Khoo, Spirit of Wood: The Art of Malay Woodcarving, Periplus, 2003.