Butterfly Kate Yarn Caddy Kit includes one Flat-Pack Yarn Caddy with a black whorl (pictured in purple), one standard wood Butterfly Kate, and two TensiTamers. TensiTamers are a special device that provides individually-tunable braking tension to the bobbin when loaded on our Butterfly Kate. These TensiTamers can also be used as a yarn guide if desired. Butterfly Kate in Cherry wood.