Rubber heart

After the first failed attempt to make a latex heart, my house mate Tracey gave me a small block of volconized rubber. She had it left over from an old University project, i tried looking online to find some more of the rubber as there was only enough to make one side and ideally i wanted to make two sides of the heart to make it whole. However it proved somewhat difficult as the rubber is used in industry and can not just be bought in an art shop. So i could only make one side of the heart.