The Hathor Mistress of Music Sistrums have a closed loop.

Hathor Mistress of Music Sistrum No. H201

Hathor Mistress of Music Sistrum
SIDE 1

The Hathor Mistress of Music Sistrum No. H201 is 10 1/2 inches (26.5cm)  tall and weighs 17 oz (460g).

Egyptian stone sistrumsistrum
SIDE 2