Rattle - Tuned 600Hz rattle in body. YAMASHITA researched in conjunction with a leading Japanese university and discovered squid can pick up sounds between 400Hz and 1400Hz with 600Hz being the most effective. Warm Jacket - Thermo storage cloth will transfer any lightinto heat for a more natural apperal. Double crown hooks - stainless steel hooks Slim Nose design - Yamashita have a paint on the slim nose design on the LIVE jigs. This slim nose heips impart a sharp darting action (more action with less effort from the angler)