Maracas

[Renato]

Canister rattles with handles originally made from [gourds] or rawhide and filled with beads, pebbles, seeds or the like Hand held and played in pairs
An important Cuban instrument, probably of African origin, pairs of gourds with pebbles or seeds inside that rattle when shaaken [Maracas] have the following stages of [sound production]: energy source: muscle vibrating element: pebbles or seeds resonating chamber: gourd.

[Monty]

a musical instrument consisting of two hollow containers filled with beans or small stones. They are shaken to provide the rhythm for some types of music.