CenturionPro Dry Batch Trimmer Model 5 w Speed Control Humidifier represents that this product is 36" Assembly represents that this product is a minimum risk pest control product and qualifies for exemption from EPA registration under the Federal Insecticide Experience exceptional color balancing for Metal Halide lighting with our proprietary polycarbonate lenses manufactured for us to exacting standards by Carl Zeiss Vision Our DBT Model 5 also features a timer valve so you can set it and forget it and not worry about over trimming your precious flower the CenturionPro Dry Batch Trimmers produce a hand trimmed quality without the use of a blower suction system or lubricants