Nickelodeon Spongebob Squarepants BFF Friendship Popper Necklace Set of 2 Fidget. SpongeBob Squarepants BFF Friendship Popper Necklace Set of 2 Fidget is the perfect gift for any young girl or boy who loves the iconic cartoon character. High-quality rubber material, these necklaces are adjustable & feature a fun popper closure that adds a touch of playfulness to any outfit. Makes a great backpack dangler. Bright yellow color and SpongeBob themed design. Whether worn together or separately, these necklaces are sure to bring a smile to any child's face. No longer manufactured. New never worn