Just acquired some deep V gipiemme rims. Clinchers 700C. I believe they are of an alloy material as they are silver with no braking surface (non-machined). The rims are labeled: Gipiemme
Tecno R428

My question is when I build these wheels, do I need to use nipple washers? I don't see any eyelets in the rim and they are constructed so that you cannot see the nipple when laced, just the spoke going straight into the rim. Is it ok to build these without washers? Won't the nipple rip right through the rim if tension is too high? Just wanted to know before I ordered the spokes.
Thanks in advance...