Abstract: The invention is a stringed instrument having string vibrations transmitted through a bridge directly to an interaction region of a soundboard, to the exclusion of vibrations via other paths.

Abstract: The invention is a high-efficiency wheel product for use with various ground vehicles. The product is designed to provide rolling support to the vehicle and to accommodate various surface conditions, for example, smooth pavement, rough pavement, potholes, dirt roads, and other conditions. The wheel product includes a multi-chambered pneumatic tire designed to minimize energy loss between the tire and a rolling surface by substantially reducing tire flex, a main source of energy loss in ground vehicles. Additionally, the product can reduce the need for conventional drive train elements such as shock absorbers.