Check the listing for details. Herrschners® Be Mine Valentine's Mailboxes Plastic Canvas Kit. Condition: New. Listed at 16.99 USD. Deliver valentines and sweet treats in a hand-stitched mailbox. Covered in messages of love, these cute plastic canvas mailboxes make darling decorations for Valentine’s Day that you can fill up with sweet notes and treats for your valentines. This complete kit includes 7-mesh plastic canvas, acrylic yarn, Velcro, needle, and instructions to create all 3 mailboxes shown, measuring 3 x 5 x 4" (7.6 x 12.7 x 10.2cm). Imported. • This plastic canvas kit includes 7-mesh plastic canvas, acrylic yarn, Velcro needle, and instructions. • This is a set of 3 mailboxes. • Finished mailboxes measure 3 x 5 x 4" (7.6 x 12.7 x 10.2cm). • Plastic canvas mailbox designs are embellished with hearts and the messages “Love,” “XO,” and “Be Mine.”.