Washable 4-in-1 Stamp Pad Electric ColorsThis washable 4-in-1 electric color stamp pad is perfect for rubber stamps and for decorating with child hand prints and mementos. Aids students with counting, sorting, grouping, connecting, and comparing items. Features four colors: Hot Pink, Purple, Turquoise, and Lime Green. The dye-based, unscented ink is completely child safe, non-toxic, acid-free, and archival quality. Measures 3" x 1 1/2". Conforms to ASTM D-4236.