What plugins are there to help with sales by weight

Hello all. I’ve been working on the site for the past 2 months and recently, we’ve been pushing out meat sales. However, since its meat, we need a dropdown for our customers to choose the meat size. I’ve attached an example for what we need. I’m not sure what plugin is there. I’m using the cristiano theme on wordpress.

image

Link to example: https://www.hubers.com.sg/Productlisting.aspx?CatID=SABVAEIARQBSAFMAMQBIAFUAQgBFAFIAUwA=