From Kakure Kobo GreenOcean: These are mixing balls that can be used for mixing colorants and other materials. You can use them to shake and mix things like solidified glitter. I will send image 4. ↓ Official Information Mixing Balls "A Little Big! Masaru's BIG Gintama" 20 pieces ◆Specs◆ ○ Quantity: 20 pieces ○ Size: Approximately 7mm ○ Color: Silver Kakure Kobo GreenOcean GreenOcean Masaru Resin Handmade Colorant Materials #HalloweenOnMercari