This Earth Day craft is a lovely way to add a little beauty to our planet. These plastic containers are great classroom supplies to use in your botany lessons. Use your own markers to make a personalized flowerpot, then plant anything your heart desires - flowers, ivy, a cactus or small sprouts. Stock up and have enough for your own window sill or urban garden. Plastic. 3 3/4" x 4 1/4" diam. Remove insert before washing. OTC Set of 12 This Earth Day craft is a lovely way to add a little beauty to our planet. These plastic containers are great classroom supplies to use in your botany lessons. Use your own markers to make a personalized flowerpot then plant anything your heart desires - flowers ivy a cactus or small sprouts. Stock up and have enough for your own window sill or urban garden. Plastic. 3 3/4 x 4 1/4 diam. Remove insert before washing.