This expanding sponge is vacuum packed to save space and reduce packaging. But when unleashed its the perfect size for cleaning your bike! When opened leave it in a bucket of water and watch it grow!The best things come in small packages. Vacuum packed to reduce plastic packaging, leave the expanding microcell sponge in water for one to two hours, and watch it grow. Combining amazing cleaning power with a durable finish to help remove every spec of dirt by using microcell technology to trap dirt in the sponge.