This response system, known as "String On String" (S.O.S. for short), consists of many holes drilled around the bearing area. Through these holes, yo-yo string would be threaded using a plastic threading needle included with the yo-yo. This allows the response to be very customizable. The user can utilize different types of string, thicknesses, and threading patterns to achieve his/her desired level of responsiveness. It is also complimented by tiny starbursts placed between the string response and the ball bearing.