NIMUNO LOOPS TOY BLOCK TAPE For LEGO Remove & Stick Adhesive

Nimuno Toy Block Tape. 

It's a non-marking, plastic tape that has a washable adhesive and is removeable.  It's compatible with LEGO, Mega Bloks and Kre-O blocks.  Each roll contains 3.2 feet of tape.  One roll is a 4-stud roll in green and the other roll is a receiver roll