Cascade Washers

We were looking at several cascade robots and we cant figure out what spacers they were using to hold their string on. Does anyone have any ideas what they are using?

could you explain what you mean by what kind of spacers but I’m pretty sure they’re just using the basic plastic spacers or standoffs. hope this helps

robosource 1/4" OD spacers

Usually thinner spacers from McMaster Carr.