Sanford Design Kneaded Eraser, Large by Sanford, http://www.amazon.com/dp/B00006IFAJ/ref=cm_sw_r_pi_dp_D0Zcqb1JB1RET | Kneaded eraser, Eraser, Eraser art
Amazon.com: Design Kneaded Rubber Eraser Extra Large (SAN70532)- Sold Individually: Home & Kitchen