The Sunscreen will fit any of our exercise play pens, when the exercise pens are placed in a square configuration. The sunscreen has 16 brass grommets, each set 12 inches apart, and is secured to the exercise pen with plastic strap ties (included). The sunscreen is made of black woven polyethylene, with edging of black vinyl coated polyester. The sunscreen is effective in keeping debris out of the exercise pen, but serves its best purpose in keeping the hot sun off of your pet, allowing your pet to stay cool in the sunscreen shade. Includes 16 Plastic Strap Ties.