▌ The difference between M58, M68 and K Color:M58 is light gray, M68 is white, K is black Toughness: K ≥ M68>M58;Rigidity: K ≤ M68<M58 M58 is a light gray tough resin.It is very suitable for printing movable figure toys or assemblable parts. M68 is a white, tough, non-yellowing resin.It is very suitable for printing product shells, building models and sculptures. K is a black tough resin,it is very suitable for printing parts that require toughness and strength. M70 is a light salmon color high precision rigid resin,its prints have sharp details and are not easily warped. ▌ Notice【As toughening agent】Mixing F69/F39/F39T resin with tough resin such as K/M58/M68/G217 can make the printed parts tougher, more durable, and not brittle for a long time. F39/F69/F39T flexible resin prints will harden at low temperatures (below 20°C). It is recommended that the prints be used in an environment above 25℃If you need prints to remain soft below 20℃, please choose F80 resin.▌ The difference between F39, F69 and F80Color:F39 is white, F69 is black, F80 is black. F39 is a white flexible resin.It has excellent tear strength and elongation at break, and the texture is similar to rubber. F69 is a black flexible resin.It has excellent tear strength and elongation at break, and the texture is similar to rubber.