Brand Name: Dr.Pen Material: Plastic Power Source: None Electric Microneedle Length: ≤0.25mm Microneedle Length: <0.25mm Microneedle Length: ≤0.3mm High-concerned chemical: None Origin: Mainland China Is Batteries Included: no Power Source: None Electric Number of Pieces: Combo Work for machine: Cartridges for Dr. pen Ultima A9 / M8S / A8S / A11 Work: One time use Needles Work: Goes up and down Type: Microneedling Cartridge: 10/20/40 pcs Needles Product absorption: up to 300% Genuine guarantee: Original dr pen Cartridges Needle material: high quality surgical stainless steel Needle diameter: 0.18mm Welcome: Dropshipping / OEM Order Warranty: 1 year Shipping deal time: 12-72 HOURS Needle use: Only work for Dr. pen A9 / M8S / A8S /A11 Choice: yes semi_Choice: yes