This is kunugi wood aged with Kawaratake mushrooms, but some pieces have a core. Even if there is a core, there is no problem with egg-laying if the other parts are sufficient. Thicker wood has more parts other than the core, so eggs will be laid there. ◎Approximate Size Thickness 9.0 x 10 cm, Length 13 cm, 3 pieces Thickness 9.0 x 10 cm, Length 15 cm Thickness 10 cm, Length 13 cm Tarandus Regius Golden Stag Beetle (Ougon Oni) Curvidens Stag beetle breeding supplies Egg-laying wood Kawaratake mushroom Be-kuwa (magazine) Type of supplies...Larval rearing supplies/Kinshi bottles Type of insect...Stag beetle