organicKidz Wide Mouthed Nipples - Slow Flow - 2 Pk - For stainless steel baby bottles - Free from BPS, BPA, PVC, Phthalates, Lead and all other toxins organicKidz Wide Mouthed Nipples come in 3 flows: Slow Flow - Includes 2 soft silicon nipples - Made from food grade silicon - Vented to reduce air intake - Recommended for ages 0-3 months Medium Flow - Includes 2 soft silicon nipples - Made from food grade silicon - Vented to reduce air intake - Recommended for ages 3-6 months Fast Flow - Includes 2 soft silicon nipples - Made from food grade silicon - Vented to reduce air intake - Recommended for ages 6+ months