Specifications:

4-inch high-speed model * installation-free [1 electricity, 1 chain] 5-core * carton [battery upgrade

4-inch high-speed model * installation-free [2 electricity and 2 chains] 5-core * carton [battery upgrade

4-inch high-speed model * installation-free [1 electricity 2 chains] 10 cores * plastic box [battery upgrade

4-inch high-speed model * installation-free [2 electricity and 2 chains] 10 core * plastic box [battery upgrade

6-inch high-speed model * installation-free [1 electricity, 1 chain] 5-core * carton [battery upgrade

6-inch high-speed model * installation-free [2 electricity and 2 chains] 5-core * carton [battery upgrade

6-inch high-speed model * installation-free [1 electricity 2 chains] 10 cores * plastic box [battery upgrade

6-inch high-speed model * installation-free [2 electricity and 2 chains] 10 core * plastic box [battery upgrade

6-inch high-speed model * free of installation [2 electricity and 2 chains] 15 core * plastic box [battery upgrade

6-inch brushless strong * installation-free [1 electric 3 chain] 10 core * plastic box [battery upgrade

6-inch brushless strong * installation-free [2 electricity and 3 chains] 10 core * plastic box [battery upgrade

6-inch brushless strong * installation-free [2 electricity and 3 chains] 15 core * plastic box [battery upgrade

8-inch brushless strong * installation-free [1 electric 3 chain] 10 core * carton [battery upgrade

8-inch brushless strong * installation-free [2 electricity and 3 chains] 10 core * carton [battery upgrade

8-inch brushless strong * installation-free [2 electricity and 3 chains] 15 core * carton [battery upgrade

4-inch high-speed * installation-free [bare metal] carton does not contain batteries and chargers