what is a19 medium base bulb

{"cid":"91136524","title":"filament A19\/A60 led bulbs light Edison type lamp E26 Medium nickle base","imgUrl":"https:\/\/img.ismap.com\/nimg\/3a\/76\/f0e9549f75ab9f228df5291f7b3b-200x200-1.jpg","attrs":{"Price":"4.5","Brand Name":"venus","Model Number":"A60-6S6W","Minimum Order Quantity":"100","Delivery Time":"10-30days","Place of Origin":"Guangdong","Certification":"CE.ROHS,ETL","Packaging Details":"Blister+inner box","Payment Terms":"T\/T,PAYPAL,WESTERN UNION","Supply Ability":"1000\/PCS PER DAY"}}

{"cid":"91198423","title":"Snowman 1.5W 210lm A19 E26 ecorative Filament Bulb","imgUrl":"https:\/\/img.ismap.com\/nimg\/3f\/23\/ca38cc89a9e88a47962f9300d8df-200x200-1.jpg","attrs":{"Price":"USD3.00-USD12.00","Brand Name":"filamentlux","Model Number":"VFL-165280-A","Minimum Order Quantity":"3000PCS","Delivery Time":"20-25days","Certification":"ce, EMC, Energy Star, FCC, LVD, Reach, RoHS, UL","Place of Origin":"China","Payment Terms":"T\/T or L\/C","Supply Ability":"500kpcs per month","Packaging Details":"Color box","Type":"A60\/C37\/G80\/ST64\/T40","Input Voltage(V)":"AC120V\/230V","Lamp Luminous Flux(lm)":"250-1055","CRI (Ra>)":"80","Working Temperature(\u2103)":"-20 - 40","Working Lifetime(Hour)":"25000","Lamp Body Material":"Glass","Base Type":"E26 \/E27\/E14\/E12","Application":"Residential","Light Source":"LED","Color Temperature(CCT)":"Warm White","Lamp Luminous Efficiency(lm\/w)":"100-120lm\/W","Warranty":"3 years","CCT":"22OOK\/2700K\/3000K\/4000K\/6000K","Glass":"Clear\/Amber\/Frosted","Dimmable":"Optional","IP Grade":"IP20"}}