Rocars or samba shakers with jingles come in two main forms, either with a metal frame with jingles mounted within, or with a wooden handle with the jingles mounted outwards
Metal frames rocars tend to have more jingles and are louder but heavier. They can also tend to have a shorter lifespan as you are basically hurling metal against metal with great force
Rocars are much louder than the ganza and can hold their own and cut across the drumming section but the technique requires more precision