Answers.Body: <p>It is a <a href="https://www.bricklink.com/catalogItem.asp?P=98138" rel="nofollow noreferrer">Tile 1 x 1 Round, with groove</a></p>
  
  <p><img src="https://i.sstatic.net/xOqua.jpg" alt="Tile 1 x 1 Round, with groove"></p>
  
  <p>Edit after clarification in the question:</p>
  
  <p>The arms have something that looks like a bit of <a href="http://www.bricklink.com/catalogItem.asp?P=78c02" rel="nofollow noreferrer">Hose, Ribbed</a> cut to the required size.</p>
  
  <p>The gun is, as gev pointed out, based on a standalone <a href="http://www.bricklink.com/catalogItemPic.asp?P=13608" rel="nofollow noreferrer">ray gun piece</a> that has the ribbed section molded in originally.</p>
  
  <p><img src="https://i.sstatic.net/QtHdj.jpg" alt="http://www.bricklink.com/catalogItemPic.asp?P=13608"></p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-30T09:45:49.897Z
Answers.Text: Sorry I didn't make it clear first. Maybe new picture will help?
Answers.UserDisplayName: Recca Chao
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-30T09:50:39.743Z
Answers.Text: I am not so sure about it, but could it be flex hose cut to size? http://www.bricklink.com/catalogItem.asp?P=78c02 You should probably ask the creator directly :)
Answers.UserDisplayName: zovits
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-30T10:35:39.870Z
Answers.Text: You can see the cut hose technique in other MOCs in the series, especially [here](https://www.flickr.com/photos/legocy/16384530492/in/photostream/) and [here](https://www.flickr.com/photos/legocy/16197822918/in/photostream/)
Answers.UserDisplayName: zovits
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-30T09:14:05.180Z
Answers.LastActivityDate: 2015-03-30T10:30:29.807Z
Answers.LastEditDate: 2015-03-30T10:30:29.807Z
Answers.UserDisplayName: zovits
Answers.Body: <p>The bit held in the mech hand is a <a href="http://www.bricklink.com/catalogList.asp?q=ray%20gun" rel="noreferrer">Ray gun</a>.</p>
  
  <p>The bit on the forearms is almost certainly a short bit of <a href="http://www.bricklink.com/catalogItem.asp?P=78c02" rel="noreferrer">Hose, Ribbed 7mm D. 2L</a> like zovits said.</p>
  
Answers.ContentLicense: CC BY-SA 3.0
Answers.CreationDate: 2015-03-30T10:01:32.613Z
Answers.LastActivityDate: 2015-03-30T10:01:32.613Z
Answers.UserDisplayName: gev
Body: <p>I saw a moc from <a href="https://www.flickr.com/photos/legocy/16359474006/" rel="nofollow noreferrer">here</a>.</p>
  
  <p><img src="https://i.sstatic.net/hDKmV.jpg" alt="enter image description here"></p>
  
  <p>But have no idea what the piece it use on the arms of the robot, and on the guns.</p>
  
Tags: <part-identification><moc>
Title: What's the circle piece in this MOC?
UserDisplayName: Recca Chao
ThreadText: # What's the circle piece in this MOC?
  
  (Asked by: username_0 on 2015-03-30)
  
  I saw a moc from [here](https://www.flickr.com/photos/legocy/16359474006/).
  
  ![enter image description here](https://i.sstatic.net/hDKmV.jpg)
  
  But have no idea what the piece it use on the arms of the robot, and on the guns.
  
  **Tags:** part-identification, moc
  
  ---
  
  ## 2 answers
  
  ### Answer by username_1 on 2015-03-30. Score: 2 | Accepted answer
  
  It is a [Tile 1 x 1 Round, with groove](https://www.bricklink.com/catalogItem.asp?P=98138)
  
  ![Tile 1 x 1 Round, with groove](https://i.sstatic.net/xOqua.jpg)
  
  Edit after clarification in the question:
  
  The arms have something that looks like a bit of [Hose, Ribbed](http://www.bricklink.com/catalogItem.asp?P=78c02) cut to the required size.
  
  The gun is, as gev pointed out, based on a standalone [ray gun piece](http://www.bricklink.com/catalogItemPic.asp?P=13608) that has the ribbed section molded in originally.
  
  ![http://www.bricklink.com/catalogItemPic.asp?P=13608](https://i.sstatic.net/QtHdj.jpg)
  
  > **Comments:**
  > **username_0**: Sorry I didn't make it clear first. Maybe new picture will help?  
  > **username_1**: I am not so sure about it, but could it be flex hose cut to size? http://www.bricklink.com/catalogItem.asp?P=78c02 You should probably ask the creator directly :)  
  > **username_1**: You can see the cut hose technique in other MOCs in the series, especially [here](https://www.flickr.com/photos/legocy/16384530492/in/photostream/) and [here](https://www.flickr.com/photos/legocy/16197822918/in/photostream/)  
  
  ---
  
  ### Answer by username_2 on 2015-03-30. Score: 5
  
  The bit held in the mech hand is a [Ray gun](http://www.bricklink.com/catalogList.asp?q=ray%20gun).
  
  The bit on the forearms is almost certainly a short bit of [Hose, Ribbed 7mm D. 2L](http://www.bricklink.com/catalogItem.asp?P=78c02) like zovits said.
  
  
  ---
  
  