... 1 neck size: 18mm, 20mm, 24mm, 28mm... 2.color: optional 3.factory original 18mm-28mm(neck size) PP/PE Plastic Lotion Spray ... Pump 2). Material: PP/PE 3). Capacity: 18mm, 20mm, 24mm, 28mm... 4). Color: optional5). Application: for soap bottle, shampoo bottle, medicine ... , hoping we could have nice cooperation.Best Regards,Rebecca 18mm-28mm(neck size) PP/PE Plastic Lotion Spray Pump