The Ryder butt plug from Tantus is arguably the best there is. Premium, medical grade silicone and a great, comfy base make this #1 in my book. It is 4" long with 3 3/4" insertable and 1 1/2" diameter. After you read the 30 something reviews you will want to see for yourself. Great warm up for anal sex or for a solo masturbation session.