silicone;Get nostalgic with this timeless classic toy! Fun sticky goo packed in individual eggshells; Putty matches egg color; Egg shells get packed in traditional egg crate for shipping; May also be used as a stress reliever; When compressed into a ball, Nutty Putty bounces; Nutty Putty transfers oil based inks, traditionally used to print newspapers (as shown), to other surfaces (does not work with soy-based inks); Note: Putty made in the USA (shells made in China); WARNING: CHOKING HAZARD - small parts. Not intended for children under the age of 3; Shipping available to US addresses only; Product Size: 2.5" h x 1.5" dia.;