| Brand | Model | Color | Width x Height | Thickness | Weight | Area density | Source | Created |
|---|---|---|---|---|---|---|---|---|
| Kokutaku | 868 red sponge | red | 165 x 164 mm | 2.0mm | 63g | 0.233 g/cm² | Source | about 5 years ago |
| Kokutaku | 868 red sponge | black | 165 x 164 mm | 2.0mm | 58g | 0.214 g/cm² | Source | about 5 years ago |