I'm a longtime SMD repair technician (but not for phones). I bought these to fix my wife's Galaxy S7. Plastic picks (petals) have a raised area in the middle that prevents them from being glued beyond a shallow depth (too shallow to fully break the glue on the back of the phone) Different types of plastic for different heat/stress needs, but i have no idea what's what, but I'm new to cell phone repair so maybe it's just general knowledge for those in the industry.
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