The amino silane surface on UltraGAPS™ slides is ideal for printing long (>50 mer) oligonucleotides. These slides have a more hydrophobic surface than competitor slides, resulting in smaller spots. A quality certificate is included in each box of slides. Each lot is tested for consistent spot morphology, signal intensity, and low background in a hybridization assay. The results of nine quality parameters are listed, including DNA retention and an image of the spot morphology for that lot of slides. Each case of UltraGAPS slides includes optimized protocols for use and troubleshooting hints. Options: barcodes, bulk packaging (25/pack instead of 5/pack).