Adorn your home or venue for ghoulish events with these glamorous black and gold decorative latex balloons'. '.strtoupper('p')erfect for adding a glitzy touch to any spooky occasion these halloween black and gold latex balloons feature a stylish gold bat pattern and will compliment decorations at batman and harry potter children's birthday parties or themed adult celebrations.these fantastic black and gold balloons each measure 28cm 11 when inflated pack of 10.suitable for inflation with air or helium'. '.strtoupper('t')o inflate with helium, you will need to purchase a helium cylinder for 30 balloons or helium cylinder for 50 balloons'. '.strtoupper('m')any florists also offer an inflation service for a small fee'. '.strtoupper('a')ll our latex balloons are biodegradable.