The Tantus Flex is made for double penetration, and let me tell you something; it does that oh so very well. This is a toy that I feel was well tested. It's not like one of those plastic massagers you get and think, "Geeze, does this work for anyone?" No, not the Flex. From the density and texture of the silicone, to the position, shape and size of the arm, to the look and feel of the dildo; this toy was made for DP and goddamn does it do it well. While this was certainly made for female-bodied individuals who enjoy simultaneous stimulation their pussy and ass, other people can enjoy this too. If you are male bodied, why, you have two insertion choices for the price of one! If you don't know if you like stuff in your bum, the arm can just as easily be not inserted and you still have a fantastic dildo and bullet. One of the most brilliant things about the Flex, is the fact that it is well-suited for both beginners and advanced users, though size Kings and Queens may not find it filling enough, the stimulation it provides makes up for that, and most users will probably be wholly satisfied.

Like I said, the density and texture of this toy are freaking spot-on perfect! The Flex is not super flexible, as the silicone is fairly dense. It does have a bit of squish to it and is soft enough to be comfortable, but dense enough to be easily inserted and give you pressure where you want pressure. Silicone retains heat and will stay warm during your play time. It can be given a warm bath beforehand to make it more comfortable. It is also non-porous, paraben, phthalate and latex free and hypoallergenic. It has no smell and no taste.

The anal arm is more flexible than the dildo (it's much thinner) and can therefore be easily moved out of the way if you're not feeling the DP.

The silicon is smooth and luscious. The color is gorgeous, with almost iridescent flecks of gold, pink, purple and blue. You will only need a little bit of lube (if any) on the dildo part, and a pretty small amount on the anal arm. I genuinely believe that this is a fantastic toy for both beginners and advanced users, as long as you know what you like, or have an idea of what you might like.
Flex is also harness compatible and will work with Tantus' Suction Cup.
The bullet is metallic plastic with the Tantus logo on it.

Once again, I have to give praise to Tantus for coming up with a non-porous DP toy that was so very well designed.
The whole toy stands 7 1/2" inches high, with 5 1/2" insertable and 1 1/4" across (at the widest part) for the dildo part, and 4 3/4" insertable and 3/4" across for the anal part.
The head on the dildo is pronounced enough that it should provide excellent stimulation but not get caught on the pubic bone. The anal beads are small enough and graduated enough that you can easily thrust with them, but they have enough of gap that they feel freaking beyond amazing. They don't create that feeling of fullness, but each pop of a bead sends shivers down my spine while thrusting. The toy is phallic in shape, and people will surly know that this is a sex toy, but the color and anal arm give it a bit-o-whimsey.

The bullet hole is at least 3" deep and has ribs to hold onto the bullet and transmit vibrations.
I personally didn't find that the bullet did much for me while in the toy, but it makes a damn fine clit vibrator. Be sure to lube the bullet up before inserting it in the toy, as it can be difficult to get out.
The bullet is just over 3" long and only slightly smaller than the high intensity bullet.

It only has one vibration, but that vibration is uncommonly strong and quiet. This is my new favorite bullet. I don't even care that it takes N batteries. The O-ring and button on the bullet are purple, which I find adorable, and it is totally waterproof...yay!

Since Flex is Tantus' premium silicon, it is easily cared for. As long as the bullet has been removed, you can toss him in a pot of boiling water for 3 minutes, throw him in the dishwasher (no soap, please), wipe him down with a 10% bleach solution, toy cleaner, or a toy wipe. An antibacterial soap and water bath works well too, in a pinch. Flex is only compatible with water-based lubes (though I hear that you can use silicone lube on some of Tantus' toys, be sure to do a spot test first). Keep him out of direct sunlight and away from other toys, always make sure he is clean and dry before you store him. You will probably want to rinse him before each use as well as after, since silicone attracts fuzzies like it's going out of style...which to be fair, I don't think fuzzy silicone ever was in style.

Flex comes in the same packaging as all other Tantus toys; a clear plastic box with a clam-shell molded to your toy, that is great for storage, but less than discreet because of the clear window on the front. The box has minimal, but sufficient information and can be recycled.

I literally could not be happier about this toy. It is a great investment for anyone who thinks they might, even maybe be a fan of DP. Get Flex and enjoy. As well as being a toy that does wonderful things, it also matches my hair, which is just a little personal bonus ;)