Light Weight Eva Foam DJ Marshmellow LED Halloween Helmet Mask + Batteries Lightweight eva foam won't pressure your neck, still sturdy and quality look Adjustable Flash mode BATTERIES INCLUDE Mask weigh : 11.4 oz The Size is 23.5 x 25 x 0.5 cm / 9.25" x 9.8" x 0.196", The DJ mask be made of high-quality environmental EVA Foam material.