The Stunning Kaiko Spikey Hand Roller is the lightest in the range, so that the tactile input is the 'hero' when using.   It provides both endless stimmy rolling and high input.   Also a tool for safe 'ouch' when squeezed.  Amazing for those that need to constantly keep hands busy & to assist with agitation and anxiety.   May be a useful tool for harm reduction, tactile input and sensory desensitisation.