Highly durable and inexpensive, our Magnets are constructed of gloss white magnetic material, available in 20 mil thickness and 30 mil thickness. Thickness may vary slightly. Surface can also be used with a dry erase pen for memo boards, charts, etc. Dry erase pens sold separately. Magnets are packaged in bulk. Complies with Prop 65. 2.25" L x 2.25" W x 20mil Thick