This is slime made by a famous overseas blogger♪ I've used it a few times. There may be some dust. If you buy multiple items together, you can get a 200 yen discount. Too hard: Place it in a warm place like direct sunlight or inside a kotatsu for a while. Or, mix in a little glycerin. Too soft: Mix the included borax with 50ml of lukewarm water to make borax solution, and gradually mix in the borax solution to harden it. ※This is a handmade product made overseas, so there may be small scratches or dust.