This massage gun dildo works well with either the small (3 inch x .50) or large (4 inch x .70) vac-u-lock attachments so it fits in either size massage gun. Massage guns come in a couple of different sizes, so finding dildos that work with the small vac-u-lock add on attachments can be hit and miss and generally a hassle. This particular massage gun dildo is a double hit because it works with either the small (3 inch x .50) or large (4 inch x .70) vac-u-lock attachments so it will fit in either massage gun. This is great when trying to find these particular dildos! Regarding the dildo, it is neither too soft or too hard, which is nicer for a beginner female. Some of these dildos can too firm and uncomfortable for some females or too soft and floppy, making them harder to get in. The length is good, it has great heft and nice thickness. This dildo will also work with a Sybian or a Motorbunny because of the versatility of the adaptation to different sized Vac-u-locks! You will be happy with this purchase!