the material should be available in different durometers affording a member of material which can be easily stretched or compressed a second member of greater durometer affording more strength to distort the member and even a harder material to require even greater strength and exertion to flex the member the material can thus vary in durometer from 20 to 80 shore hardness a preferred series would be 20 40 and 60 hardness values in these hardness ranges the devices would be of different pigmented or colored material to designated the elasticity in use the device 5 may be placed in the palm of the hand and closing the hand will bring the fingers against the sides causing them to flex and crush the walls to close the openings 8 this exercise exercises the flexors i e carpi ulnaris palmaris congus carpi radialis digitorum superficialis and digitorum profundus alternatively the finger tips and thumb may be placed in the five holes and then the fingers are moved to spread them apart this exercise differs from that of the prior art devices and exercises the extensors i e extensor carpi ulnaris digiti minimi digitorum indicis extensor carpi radialis longus and brevis and the thumb pollicis longus pollicis brevis abductor pollicis longus and flexors pollicis longus further a finger or a pair of fingers from each hand can be placed in the holes 8 by separating.