In this paper, we present Haptic Prop, a semi-passive, pico-powered, tangible prop, which is able to provide programmable friction for interaction with a tabletop setup, such as interactive workbenches or fish-tank VR. We explore the interaction space, its basic components, and constraints. Haptic Prop can be used to provide haptic feedback to the user at different levels and in different directions. We have conducted a preliminary user study evaluating the users' acceptance for the device and their ability to detect the programmed level of friction for rotation and linear movements. While currently still preliminary, the results demonstrate the utility of our device and outline some promising directions for future work.