African blackwood nunchaku

"African Blackwood is a flowering plant in the family Fabaceae , native to seasonally dry regions of Africa from Senegal east to Eritrea and south to the Transvaal in South Africa . The tree is an important timber species in its native areas; it is used in the manufacture of musical instruments and fine furniture."
-----------wiki

African Blackwood is very heavy, its specific gravity 1.26, so this wood will sink to the bottom in water.